Hình vẽ bên mô tả quá trình nén khí trong xilanh. Ban đầu khí có nhiệt độ 300 K được giữ không đổi và pittong ở vạch số 4 của xilanh. Bỏ qua ma sát giữa pittong và xilanh, coi khí trong xilanh là lí tưởng. Kết luận nào đúng?

Ở thực vật, nguyên tố dinh dưỡng khoáng thiết yếu nào là nguyên tố vi lượng?

Phát biểu nào sau đây không đúng khi nói về kim cương, than chì và than đá?

Một vật chuyển động tròn đều với chu kì T, tần số góc ω, số vòng mà vật đi được trong một giây là f. Chọn hệ thức đúng?

Điều kiện của tham số \(m\) để phương trình \(\text{cos}x=m-2\,021\) có nghiệm là

Mô hình doanh nghiệp có các đặc điểm nào?

Loại thuốc thử nào được dùng để nhận biết sự có mặt của protein trong tế bào?

Số nghiệm nguyên dương của bất phương trình \(\sqrt[3]{25 x\left(2 x^{2}+9\right)} \geq 4 x+\frac{3}{x}\) là

Mặt hàng xuất khẩu chủ lực của nước ta hiện nay là

Đối với mỗi cá nhân, hành vi phạm quyền và nghĩa vụ công dân về bảo vệ Tổ quốc sẽ gây nên hậu quả gì?

Kí hiệu trong hình bên thể hiện thiết bị điện nào trên sơ đồ hệ thống điện?

Read the following advertisement about a new travel platform and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 1 to 6. (1,5 points)

DISCOVER NEW TRAVEL BUDDIES WITH TRAVELMATE

"Who will you explore your next destination with? Will they share the same (1) ____________ for adventure, or will they prefer a more relaxing trip?" If you often wonder (2) ____________ your travel companions before your next vacation, we have exciting news for you! TravelMate, a (3) ____________, allows you to select your future travel buddies before your trip. This service is designed to give you a more enjoyable and personalized experience. All you need to do is share your travel preferences with the platform, and you'll be matched with others (4) ____________ similar tastes. Whether you're looking to make new friends or reconnect with previous ones, TravelMate (5) ____________ it easy. If you're seeking adventure or simply want (6) ____________ a relaxing getaway, there's a perfect match waiting for you!

Người dân ở nhóm nước phát triển thường có tuổi thọ trung bình cao hơn ở nhóm nước đang phát triển do đâu?

Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17.

Question 15: 

Hi Gemma,

a. But it was interesting to watch these videos.

b. Thanks so much for the guitar lesson videos you sent me last week.

c. You know, we ought to practise together for some time. What do you think?

d. Thanks also for the tip about the free websites with musical lesson videos - they are much better than the sites I've been following.

e. It's really nice to learn how to play a new instrument like the guitar, but I am too busy at the moment, so I'm focusing on my violin lessons for now.

Write back soon.

Billy

(Adapted from THINK)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 1 to 5.

The process of sorting through the various holidays on offer and determining which is the best for you is inevitably complex and individual personality traits will determine the eventual decision. Some people undertake a Other process of extensive problem solving, in which information is sought about a series of products, (1) _________ . Other consumers with no patience to explore a variety of choices (2) _________ , for the sake of their convenience rather than trying to guarantee that they buy the best possible product. This is known as limited problem solving.

Many consumers engage in routinised response behaviour, in which choices change relatively little over time. (3) _________ . Also, some holidaymakers who have been content with a particular company or destination in the past may opt for the same experience again. 

Finally, some consumers will buy on impulse. (4) _________ .  It is, in fact, a pattern of behaviour that is becoming increasingly prevalent -- to the dismay of the operators, who then have less scope for forward planning and reduced opportunities to gain from investing deposits in the short term. (5) _________ , where 'distressed stock' needs to be cleared at short notice and this can be stimulated by late availability offers particularly.

(Adapted from The business of tourism)

Choose the best answer for number 1:

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 31 to 40.

Biting into a ripe, juicy fruit brings a smile to many people’s faces. But eating that same fruit a week before it is ripe probably wouldn’t be as enjoyable! Unripe fruits are often hard and bitter, but that serves a purpose. The hard exterior of an unripe fruit protects the developing seed inside. After a seed fully develops inside the fruit, the fruit changes color, softens, and gets sweeter to become more attractive to animals and humans. These organisms eat the fruit and spread its seeds, ensuring the plant’s survival and regrowth.

But how does a fruit ripen? The ripening process involves many complex chemical reactions. When a fruit ripens, it goes through a chemical change. A chemical change happens when bonds within molecules break, and the atoms that once formed them regroup into new molecules. Chemical changes are irreversible. Once a fruit ripens, it cannot become unripe again.

One molecule responsible for this chemical change is ethylene. Ethylene (C2H4) is a colorless gas made up of carbon and hydrogen atoms. (I). It is a naturally occurring molecule in the atmosphere. (II). It is also an important plant hormone. (III). Plants release ethylene through the growing tips of roots, flowers, and ripening fruit. (IV). Although ethylene serves other purposes in plants, one of its main purposes is to trigger the chemical reactions that cause fruits to ripen. As the fruit matures, oxygen in the air helps stimulate the production of ethylene. This ethylene production is a signal that begins fruit ripening. For that reason, unripe fruits have low levels of ethylene, while ripe fruits have higher levels of ethylene. Most fruits produce ethylene and respond to ethylene in the atmosphere.

Although fruits require ethylene to ripen, different types of fruits respond to this molecule in two distinct ways: non-climacteric fruits and climacteric fruits. Non-climacteric fruits do not ripen after harvesting. They produce very little ethylene of their own. Climacteric fruits, on the other hand, continue to ripen after they are picked. These fruits produce a large amount of ethylene. Climacteric fruits can also speed up the ripening process of other fruits nearby since they release high levels of ethylene into the air.  

Which of the following can be inferred from the passage?

Đạo luật nào giữ vai trò quan trọng nhất trong các đạo luật giải quyết khủng hoảng kinh tế của Mỹ?