Số amin bậc ba có công thức phân tử C₅H₁₃N là

A. 3

B. 2

C. 5

D. 4

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 51 to 60.

  Throughout history, women have had responsibility for healing the sick. However, it is only in comparative recent times that they have been allowed to train as doctors at medical schools in Britain. Yet in that short time, they have (37) _________ an enormous contribution to modem medicine.

  The first female doctors were nuns (38) ________                         gave advice about diseases and (39) ________ and

prepared medicines. In ancient Rome, women healers were considered skillful and respected. In Britain,

for centuries, male doctors were suspicious of women who practised medicine (40) _________ and in 1512 a law was passed making it illegal for them to do so. Women couldn’t study medicine at universities (41) ____________ the 19th century and they only began to gain equality with male doctors in the 20th century.

Điền vào số 41

A. until

B. in

C. from

D. since

Loại hợp chất nào sau đây không có trong lipit ?

A. Sáp

B. Glixerol

C. Chất béo

D. Photpholipit.

Vì sao Giôn Rit đặt tên cuốn sách là “Mười ngày rung chuyến thế giới”?

Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numberPri blanks from 31 to 35.

I was raised on a farm in a remote village in the 1950s. The winter months were endless and everything was covered in snow. I was always (31) _______ for the warmer weather to come. When spring arrived, everything came alive - flowers would bloom and the animals would come out of hibernation. I would follow the bear tracks and search for them. Once, however, I (32) ____ an angry mother bear who saw me as a threat. (33) ______ the sight of the bear, I did what my father had told me. I stood still until she stopped growling and walked away. The trick was effective, but looking back now, I realized that the situation was far more serious than I thought at the time. By the age of twelve, I had lots of camping experience, as I used to go camping with my dog on my school holidays. We would spend days (34) ______ the forest, catching fish for dinner, look at the frogs and the (35) ______ of birds and the insects hopping up and down on the surface of the water. Of course, this was possible only during the warm months. When the autumn came, everything went quiet, which was quite usual in those parts. It wasn't long before the animals disappeared, the birds flew south and the snow took over. The place became desert once again.

Question 35

A. sets

B. swarms

C. bunches

D. flocks