Hấp thụ hoàn toàn 1,12 lít khí CO₂ (đktc) vào 200ml dung dịch KOH 1M, thu được dung dịch X . Cho từ từ dung dịch HCl 2,5M vào X đến khi bắt đầu có khí sinh ra thì hết V ml. Giá trị của V là:

A. 80

B. 60

C. 40   

D. 100

Choose the best answer from A, B, C or D to indicate the right answer to each of the following sentences.

She passed the National High School Graduation Exam with ______ colours.

B. flying bright

B. flying 

C. red 

D. true

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.

         Students working for their first degree at university are called undergraduates. Then they take their degree we say they graduate, and then they are called graduates. If they continue studying at university after they have graduated, they are called post-graduates. Full-time university students spend all their free time studying. They have no other employment. Their course usually lasts for three or four years. Medical students have to follow a course lasting for six or seven years. Then they graduate as doctors. In Britain, full-time university students have three terms of about ten weeks in each year. During these terms they go to lectures or they study by themselves. Many students become members of academic societies and sports clubs and take part in their activities. Between the university terms they have vacations (or holiday periods). Their vacations are long, but of course they can use them to study at home.

Medical students have to follow a course lasting for _________.

A. four to five years

B. only 4 years      

C. six or seven years       

D. about 5 years

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

I can’t _______ of a word he is saying.

A. make sense

B. grasp

C. comprehend

D. understand

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.

         Students working for their first degree at university are called undergraduates. Then they take their degree we say they graduate, and then they are called graduates. If they continue studying at university after they have graduated, they are called post-graduates. Full-time university students spend all their free time studying. They have no other employment. Their course usually lasts for three or four years. Medical students have to follow a course lasting for six or seven years. Then they graduate as doctors. In Britain, full-time university students have three terms of about ten weeks in each year. During these terms they go to lectures or they study by themselves. Many students become members of academic societies and sports clubs and take part in their activities. Between the university terms they have vacations (or holiday periods). Their vacations are long, but of course they can use them to study at home.

The word “employment” in line 4 refers to the ________.

A. work     

B. music      

C. play        

D. money

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

Smoking is an extremely harmful habit. You should give it up immediately.

A. As smoking is an extremely harmful habit, you should give it up immediately.

B. When you give up smoking immediately, you will affect your health with this harmful habit.

C. Stop your smoking immediately so it will become one of your extremely harmful habits.

D. You should give up smoking immediately and you will fall into an extremely harmful habit.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

House prices ________ greatly from one area to the next.

A. contrast

B. vary

C. distinguish 

D. differentiate

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Dogs make very _______ pets. They’ll always stay by your side

A. loyal

B. private

C. mental

D. digital

Chứng minh rằng với mọi số tự nhiên n   ≥   2 , ta có các bất đẳng thức:  2 n + 1   >   2 n   +   3

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.

         Students working for their first degree at university are called undergraduates. Then they take their degree we say they graduate, and then they are called graduates. If they continue studying at university after they have graduated, they are called post-graduates. Full-time university students spend all their free time studying. They have no other employment. Their course usually lasts for three or four years. Medical students have to follow a course lasting for six or seven years. Then they graduate as doctors. In Britain, full-time university students have three terms of about ten weeks in each year. During these terms they go to lectures or they study by themselves. Many students become members of academic societies and sports clubs and take part in their activities. Between the university terms they have vacations (or holiday periods). Their vacations are long, but of course they can use them to study at home.

According to the passage, the full-time university students have ________ of about 10 weeks in each year.

A. two terms        

B. four terms         

C. seven terms      

D. three terms