Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

A. shown

B. flown

C. grown

D. crown

Ứng dụng nào sau đây không phải của glucozơ?

A. Sản xuất rượu etylic.

B. Nhiên liệu cho động cơ đốt trong.

C. Tráng gương, tráng ruột phích.

D. Thuốc tăng lực trong y tế.

* Read the following passage and mark the letter A, R, C, or D on your answer sheet to indicate the correct answer to each of the questions from 24 to 30.

  People have been donating blood since the early twentieth century to help accident victims and patients undergoing surgical procedures. Usually a pint of whole blood is donated, and it is then divided into platelets, white blood cells, and red blood cells. People can donate blood (for red blood cells) about once every two months.

  Transfusing the blood from the donor to the recipient is straightforward. It involves taking the blood from a donor’s arm vein by means of a hypodermic syringe. The blood flows down from the container by gravity. This is a slow process and may last as long as 2 hours to complete the infusion of blood into the recipient. The patient is protected from being infected during the transfusion. Only sterile containers, tubing, and needles are used, and this helps ensure that transfused or stored blood is not exposed to disease causing bacteria.

  Negative reactions to transfusions are not unusual. The recipient may suffer an allergic reaction or be sensitive to donor leukocytes. Some may suffer from an undetected red cell incompatibility. Unexplained reactions are also fairly common. Although they are rare, other causes of such negative reactions include contaminated blood, air bubbles in the blood, overloading of the circulatory system through administration of excess blood, or sensitivity to donor plasma or platelets.

  Today, hospitals and blood banks go to great lengths to screen all blood donors and their blood. All donated blood is routinely and rigorously tested for diseases, such as HIV, hepatitis B, and syphilis. When the recipient is a newborn or an infant, the blood is usually irradiated to eliminate harmful elements. Donated blood is washed, and the white blood cells and platelets removed.

  Storing the blood sometimes requires a freezing process. To freeze the red blood cells, a glycerol solution is added. To unfreeze the, the glycerolis removed. The ability to store blood for long periods has been a boon to human health.

The word "it" refers to___________.

A. surgical procedures

B. accident victims 

C. a pint of whole blood

D. surgery patients

Có một dung dịch chứa ADN và ARN tinh khiết. Dung dịch này có độ pH

A. Lớn hơn 7.   

B. Bằng 7

C. Bé hơn 7.

D. Không xác định được

Khi nói về gen ngoài nhân, phát biểu nào sau đây đúng?

A. Gen ngoài nhân chỉ biểu hiện ra kiểu hình khi ở trạng thái đồng hợp tử. 

B. Các gen ngoài nhân luôn được phân chia đều cho các tế bào con trong phân bào. 

C. Gen ngoài nhân được di truyền theo dòng mẹ. 

D. Gen ngoài nhân chỉ biểu hiện ra kiểu hình ở giới cái và không biểu hiện ra kiểu hình ở giới đực