Một học sinh đo chiều dày của một cục tẩy, sau nhiều lần đo được các kết quả: 3,3 cm; 3,4 cm; 3,5 cm; 3,4 cm, 3,4 cm và 3,4 cm. Sai số tuyệt đối trung bình của phép đo này là bao nhiêu?

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

Deforestation may seriously jeopardize the habitat of many species.

Vì sao khi tăng nhiệt độ lên quá cao so với nhiệt độ tối ưu của 1 enzim thì hoạt tính của enzim đó lại giảm, thậm chí mất hoàn toàn?

Chọn câu đúng trong các câu sau về đổi đơn vị:

Một trong bốn hình sau đây là đồ thị hàm số \({\rm{y}} = {\log _{\rm{a}}}{\rm{x}}\) với \(0 < {\rm{a}} < 1.\) Hình đó là hình nào?

Ngôn ngữ định nghĩa dữ liệu bao gồm các lệnh cho phép ta thực hiện những công việc gì?

Trường hợp nào sau đây, lực có tác dụng làm cho vật rắn quay quanh trục ?

Người làm nghề sản xuất thiết bị điện tử thực hiện hoạt động nào sau đây để đảm bảo chất lượng sản phẩm?

Vai trò chủ yếu của các nguyên tố đa lượng là

1. Do you find yourself yawning all day at school? You probably need more sleep. However, it is not just how much sleep you get that is important. What you do before bedtime also has a huge effect on how you feel the next day. If you spend time chatting to someone on social media, or reading a book on your e- reader, you are not alone.

2. All devices' screens give out a large amount of blue light, which affects the body's production of the sleep hormone, melatonin, which can change your sleep patterns. So it is not just getting to sleep that becomes hard, but the quality of your sleep also suffers. The result is that you can wake up several times during the night, and have difficulty getting up in the morning.

3. Sleep is food for the brain, so not sleeping well can be a severe problem for anyone, especially for teenagers, because their brains are still developing. When you do not sleep well, it can be difficult to concentrate at school, which makes it harder to learn and get good grades. It can also affect your mood, making you feel sad or anxious.   

4. So, it is clear you should not use your phone before you go to sleep. Why not leave it in another room? Nothing on social media is so important that it cannot wait a few hours! You should rediscover paper books and enjoy feeling tired and sleepy before bedtime rather than wondering why your best friend has not liked your photo! How will you wake up? You do not have to use the alarm on your phone. Go and buy yourself an old-fashioned alarm clock! The negative effects that screen time is having on sleep have been in the news a lot recently, so manufacturers of smartphones and tablets have added a feature to the mobile devices that can help reduce these. Most new phones have a night-time setting that changes the colour of the screen so that it gives out less blue light. If you really cannot avoid going onto social media at bedtime, think about turning on this setting on your phone.

What does the word it in paragraph 4 refer to?

Một vật nhỏ dao động điều hòa dọc theo trục Ox. Khi vật cách vị trí cân bằng một đoạn 2 cm thì động năng của vật là 0,48 J. Khi vật cách vị trí cân bằng một đoạn 6 cm thì động năng của vật là 0,32 J. Biên độ dao động của vật bằng

Đảng Cộng sản Việt Nam là đội tiên phong của giai cấp nào?

Trong không gian Oxyz, cho đường tròn \((C)\) là giao tuyến của mặt cầu \((S):x^2 + y^2 + z^2 = 4\) và mặt phẳng \((P): 2x+y-2z-3=0\). Xét mặt cầu \((T)\) đi qua \((C)\) và tiếp xúc mặt phẳng \((Q): 2x+y-2z+1 = 0\). Tính bán kính của \((T)\). Làm tròn kết quả đến hàng phần trăm.

Nguyên nhân chủ yếu nào dẫn đến việc các nước thực dân Phương Tây xâm lược Đông Nam Á?

Người tiêu thụ những sản phẩm, dịch vụ để thoả mãn nhu cầu của mình nhằm tạo động lực cho sản xuất phát triển được gọi là gì?

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 of text in each of the following questions from 13 to 17.

Hi Dan,

a. It’s a great decision, but are you ready for the responsibility?

b. However, having a pet can really improve your mental life.

c. I've heard that you were thinking of adopting a puppy from the shelter.

d. You should consider this thoroughly, and I'm excited to know your choice.

e. You will have to feed, walk, and play with it every day. Talk to you soon,

Mike

Đối với vị trí công nhân kĩ thuật, cần đảm bảo yêu cầu nào sau đây?

Cho tập hợp: $A = \{ x \in \mathbb{R} \, \big| \, x - 5 < 4 - 2 x\}$. Viết lại tập hợp $A$ dưới kí hiệu khoảng, nửa khoảng, đoạn.

Read the following passage about education in Nepal 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. 

Fashion in the 1960s reflected the cultural and political upheaval of the time. The hippie and counterculture movement gave rise to accessories like Pocahontas-style headbands and medallions worn around the neck. Hippies wore long, loosely fitting clothing, often in natural fabrics. Hemlines rose as Mary Quant popularized the miniskirt and hot pants in her lines for JC Penney. And mod fashion, with brightly colored space-age geometric patterns, shift dresses and colored tights became the mainstream. Both miniskirts and mod-shift dresses were worn with knee-high go-go boots.

[A] During the 1970s, the loose-fitting hippie clothes of the prior decade gave way to exotic fabrics and bell-bottom jeans for men and women. Hemlines continued to rise and hot pants continued their popularity, reflecting the flashy style of the decade. However, the 1970s also saw the popularity of a longer hemline, from mid-calf to ankle-length. [B] Women wore peasant-style clothing, especially blouses with off-the-shoulder necklines and lace trim, with their jeans or skirts. [C] Disco fashion emerged, featuring bright patterns and tightly fitting clothing meant to show off the body. Platform shoes elevated their wearer, male or female, anywhere from two to four inches or more. [D]

The 1980s saw another fashion upheaval. Angst-ridden punks wore Dr. Marten and steel-toed army boots, chains, tartan patterns, and bondage pants. Punks focused more on their hair during this period, dying, teasing and chopping their hair into asymmetric styles that seemed to defy gravity. Women—and men—experimented with heavy eyeliner in a variety of colors. Women wore neon colors, jelly shoes, tight jeans, leggings, leg warmers and oversized sweatshirts. Menswear-inspired looks also became popular for both sexes. Men wore ‘power suits,’ named so for their price, which made these suits a reflection of the wealth of the wearer. Women’s jackets featured big shoulder pads that made the shoulders appear higher and larger, similar to the male silhouette.

1990’s fashion was far more subdued than the garish, wild styles of the 1980s. Bands like Nirvana influenced the grunge look, which featured rock-concert tee shirts under plaid flannel shirts, jeans and long, greasy hair. Overalls were worn by both sexes, either with one or both shoulder straps unhooked. The punk style of the 1870s and 1980s evolved into the goth fashion trend, which featured black clothing, black boots and studded bracelets in the style of bands like Nine Inch Nails and Marilyn Manson.

The word “elevated” in paragraph 2 mostly means ______.

Ngoài mục tiêu tìm kiếm lợi nhuận, chủ thể sản xuất cần đảm bảo thực hiện nhiệm vụ nào sau đây?