Thực hiện các phép đo cần thiết (chính xác đến mm) để tính diện tích ABCDE (h.152).

Cho các yếu tố sau: (a) nồng độ chất; (b) áp suất; (c) xúc tác; (d) nhiệt độ; (e) diện tích tiếp xúc. Những yếu tố ảnh hưởng đến tốc độ phản ứng nói chung là:

A. a, b, c, d

B. a, c, e

C. b, c, d, e

D. a, b, c, d, e

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 30 to 34.

A Working Vacation

Have you ever wondered what it would be like to get your dream job? It can take years to get the education and develop the skills you need for the perfect job. However, there is a way to experience your dream job without having to get the required training or degree. Since 2004, Brian Kurth’s company, Vocation Vacations, has been connecting people with mentors who have the jobs of their dreams.

Kurth had been working for a phone company before starting his own company. He didn’t like his job, and he had a long time to think about it on his drive to and from work. He also thought about his dream job while driving. He was interested in becoming a dog trainer, but he didn’t want to take any chances and switch to a field he didn’t have experience in. He really wanted to know what the job was like and if it was realistic for him to work towards his goal. So, he found a mentor – a dog trainer that could tell him about the job and everything it involved. After that, he helped his friends find mentors to explore jobs they were interested in. They thought it was helpful to talk to people who had their dream jobs before spending lots of time and money getting the training they needed for those jobs.

Kurth saw how much this helped his friends, so he decided to turn it into his business. He started Vocation Vacations in 2004, and by 2005, the company was offering experience with over 200 dream jobs. Today, about 300 mentors work with the company to share their knowledge about their jobs. Customers pay to experience the job of their dreams and work with these mentors to see what a job is really like. A “job vacation” costs between $350 and $3,000 and can be for one to three days. Many people use Vocation Vacations to see if their dream job is a career path they want to continue. Others do it just to experience the job of their dreams one time.

Vocation Vacations jobs are in the fields of fashion, food, entertainment, sports and animals. Many people want to try glamorous jobs. For example, they want to try working as actors, music producers, photographers and fashion designers. According to Kurth, some other popular dream jobs are working as bakers, hotel managers and wedding planners.

Source: Summit 2 by Pearson Education, 2017

What is the passage mainly about?

A. A company where people can experience their dream jobs

B. A company where people get the training for their dream jobs

C. Brian Kurth’s dream job as a dog trainer 

D. Brian Kurth’s company as a dream job provider 

Cho 3-etyl-2-metylpentan tác dụng với Cl 2 theo tỉ lệ số mol 1 : 1, số dẫn xuất monoclo tối đa thu được là

A. 3

B. 4

C. 7

D. 5

X, Y, Z là 3 ancol liên tiếp trong dãy đồng đẳng, trong đó M_Z = 1,875M_X. X có đặc điểm là

A. Tách nước tạo 1 anken duy nhất

B. Hòa tan được Cu(OH)₂.

C. Chứa 1 liên kết π  trong phân tử

D. Không có đồng phân cùng chức hoặc khác chức.

Từ nguyên nhân chính nào mà các giống cây như lúa lai, ngô lai thì các nhà khoa học lại khuyến khích nông dân nên mua giống mới để sản xuất hàng năm mà không nên tự để giống?

A. Trong quần thể ở các thế hệ sau tỉ lệ kiểu gen đồng hợp lặn quy định các đặc tính xấu, bệnh di truyền ở giống tăng làm giảm năng suất chất lượng của giống.

B. Do giống để giống bằng phương pháp thông thường  nên sức nảy mầm giảm.

C. Do giống có thể bị nhiễm sâu bệnh trên đồng ruộng vào giống từ các vụ trước.

D. Do giống căng quá nhiều thế hệ gen bị rối loạn hoạt động.