Xét hai mệnh đề $A:"a,\text{\hspace{0.17em}}b\in ℝ;a>b>0"$ và $B:"a^2>b^2"$.

 

a) Mệnh đề đảo của mệnh đề \(A \Rightarrow B\) là: Nếu \(a,\,b \in \mathbb{R};\,a > b > 0\) thì \({a^2} > {b^2}\).

b) Mệnh đề \(A \Rightarrow B\) là mệnh đề đúng.

c) Mệnh đề đảo của mệnh đề \(A \Rightarrow B\) là mệnh đề đúng.

d) Mệnh đề \(A \Leftrightarrow B\) là mệnh đề sai.

 

Ý nào dưới đây là thể hiện đặc điểm của mô hình sản xuất kinh doanh hợp tác xã?

Có mấy ứng dụng công nghệ cao trong bảo quản sản phẩm trồng trọt?

Các cuộc xung đột ở thế kỉ XX liên quan đến vấn đề nào sau đây?

Phenol được tổng hợp từ cumene (isopropylbenzene) bằng phản ứng oxi hóa bởi oxygen rồi thủy phân trong môi trường acid thu được hai sản phẩm là phenol và acetone theo phương trình hóa học sau:

Người ta tiến hành điều chế phenol từ 2 tấn cumene. Khối lượng phenol điều chế được từ lượng cumene trên là (Biết hiệu suất phản ứng là 90%).

Read the following passage about urban shift and mark the letter A, B, C, D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.

[I] Sperm whales are fascinating creatures. [II] They possess the biggest brain of any species, six times larger than a human’s, which scientists believe may have evolved to support intelligent, rational behavior. [III] They’re also highly social and capable of making decisions as a group. [IV] But there’s also a lot we don’t know about them, including what they may be saying to one another when communicating with a system of short clicks, known as codas.

Now, new research published in Nature Communications today suggests that sperm whales’ communication is actually much more expressive and complicated than was previously thought. A team of researchers led by Pratyusha Sharma at MIT’s Computer Science and Artificial Intelligence Lab (CSAIL) working with Project CETI, a nonprofit focused on using AI to understand whales, used statistical models to analyze whale codas and managed to identify a structure to their language that’s similar to features of human language. Their findings represent a tool future researchers could use to decipher not just the structure but the actual meaning of whale sounds.

For the study, the researchers examined recordings of 8,719 codas from around 60 whales collected by the Dominica Sperm Whale Project between 2005 and 2018, using a mix of AI algorithms for pattern recognition and classification. The AI then turned the clicks within the coda data into a new kind of data visualization called an exchange plot, revealing that some codas featured extra clicks. These extra clicks, combined with variations in the duration of their calls, appeared in interactions between multiple whales, which they say suggests that codas can carry more information and possess a more complicated internal structure than we had previously believed.

The team’s next step is to build language models of whale calls and to examine how those calls relate to different behaviors. They also plan to work on a more universal system that could be used across species, says Sharma. Taking a communication system we know nothing about, working out how it encodes and transmits information, and slowly beginning to understand what’s being communicated could have many purposes beyond whales. “I think we’re just starting to understand some of these things,” she says. “We’re very much at the beginning, but we are slowly making our way through.”

The word “universal” in paragraph 4 is closest in meaning to ___________.

Nguồn thu chủ yếu nhất của ngân sách nhà nước là:

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions from 23 to 30.

          Happiness is a universal goal, yet its ingredients differ across societies and cultures. For some, safety and security are paramount, as demonstrated by Singapore. Known for its strict laws and highly regulated environment, Singapore provides a clean, orderly, and safe place for its citizens. The government ensures access to basic necessities such as housing and healthcare, significantly reducing poverty and promoting equality. While personal freedoms may be limited, many Singaporeans find satisfaction in the stability and quality of life their country offers, showing that happiness can stem from collective security.

        In contrast, Mexico highlights the importance of social connections in achieving happiness. Despite challenges like poverty and limited access to essential resources, Mexicans often prioritize relationships with family, friends, and neighbors. Simple acts like sharing meals or gathering in the community foster a sense of belonging and emotional well-being. Psychologists have long noted that feeling part of a larger social group can be a powerful source of happiness, even when material wealth is scarce. For them, the joy derived from relationships often outweighs material concerns.

       The role of money in happiness, however, is often debated. In Mexico, many individuals live in similar financial conditions, reducing the pressure of economic competition. When neighbors lack expensive possessions, individuals are less likely to feel dissatisfied with their own circumstances. This suggests that relative wealth and equality may have a stronger influence on happiness than absolute income.

       Ultimately, there is no universal recipe for happiness. Factors like security, freedom, social bonds, and financial equality all play a role, but their importance varies depending on individual and cultural values. Happiness, therefore, remains a deeply personal and multifaceted pursuit, shaped by our unique perspectives and circumstances.                                                                   

In which paragraph does the author discuss the importance of social bonds in achieving happiness?

Tất cả các quy định của Hiến pháp là nguồn là cơ sở, căn cứ cho hầu hết các:

Read the following passage about human life expectancy and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 23 to 30. 

How long will a baby born today live? 100 years? 120 years? Scientists are studying genes that could mean long life for us all.

There are already many, many people who have passed the landmark age of 100. In fact, there are now so many healthy, elderly people that there’s a name for them: the wellderly. These are people over the age of eighty who have no major illnesses, such as high blood pressure, heart disease or diabetes.

There are many scientific studies of communities where healthy old age is typical. These include places like Calabria in southern Italy and the island of Okinawa in Japan. In Calabria, the small village of Molochio has about 2,000 inhabitants. And of these, there are at least eight people over a hundred years old. When researchers ask people like this the secret of their long life, the answer is almost always about food and is almost always the same: ‘I eat a lot of fruit and vegetables.’ ‘I eat a little bit of everything.’ ‘I neither smoke nor drink.’

In the past, scientists looked at things such as diet and lifestyle for an explanation of long life, but these days they are also looking at genetics. Researcher Eric Topol says that there must be genes that explain why people are protected from the effects of aging process. The new research into long life did scrutinize groups of people who have a genetic connection. One interesting group lives in Ecuador. In one area of the country there are a number of people with the same genetic condition. It’s called Laron syndrome. These people don’t grow very tall – just over one metre. But Laron syndrome also give them protection against cancer and diabetes. As a result, they live longer than other people in their families. Meanwhile, on the Hawaiian island of Oahu, there’s another group of long-lived men, Japanese-Americans. They have a similar gene to the Laron syndrome group.

Back in Calabria, researchers constructed the family trees of the 100-year-old people. They looked at family information from the 19th century to today. It is concluded that there are genetic factors that give health benefits to the men. This is a surprising result because generally in Europe, women live longer than men. So what really makes people live longer? It seems likely that it is an interaction of genes, the environment and probably a third factor – luck.

The word “elderly” in paragraph 2 is OPPOSITE in meaning to ______.

Phần mềm chống virus Window Defender được tích hợp trên hệ điều hành nào bên dưới?

Đâu không phải là khoáng sản nổi bật ở khu vực Mỹ Latinh?

Tình huống nào sau đây không vi phạm quyền tự do tín ngưỡng, tôn giáo của công dân?

Điều không phản ánh đúng tình hình nước ta thế kỷ XVI?

Virut tự nó không có khả năng xâm nhập vào tế bào thực vật là do cấu trúc nào sau đây?

Một đảo nhỏ xa xôi ngoài biển rộng

Vẫn tiếng làng tiếng nước của riêng ta

Tiếng chẳng mất khi Loa thành đã mất

Nàng Mỵ Châu quỳ xuống lạy cha già

 

Tiếng thao thức lòng trai ôm ngọc sáng

Dưới cát vùi sóng dập chẳng hề nguôi

Tiếng tủi cực kẻ ăn cầu ngủ quán

Thành Nguyễn Du vằng vặc nỗi thương đời

 

Trái đất rộng giàu sang bao thứ tiếng

Cao quý thâm trầm rực rỡ vui tươi

Tiếng Việt rung rinh nhịp đập trái tim người

Như tiếng sáo như dây đàn máu nhỏ

(Lưu Quang Vũ, “Tiếng Việt”, Gió và tình yêu thổi trên đất nước tôi, Nxb Hội Nhà văn, HN, 2010, tr. 104).

Giọng điệu chủ đạo của đoạn trích là gì?

Câu thơ: “Lom khom dưới núi tiều vài chú - Lác đác bên sông chợ mấy nhà” (Bà Huyện Thanh Quan) sử dụng phép tu từ cú pháp nào?

Các thành tố của hệ thống chính trị ở nước ta bao gồm:

Cho cấp số cộng \(\left(u_{n}\right)\) thỏa \(\left\{\begin{array}{c}u_{2}-u_{3}+u_{5}=10 \\ u_{4}+u_{6}=26\end{array}\right.\).

Xác định công sai của cấp số cộng.

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions: 

However old and worn his clothes were, they look clean and of good quality.

Read the advertisement and mark the option that best fits the numbered blanks from 35 to 40.

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