Điểm thuận lợi khi tiến hành nghiên cứu di truyền người là

A. những đặc điểm sinh lí của người đơn giản hơn dễ theo dõi hơn tất cả các loài động vật và thực vật khác

B. người nhìn chung đẻ nhiều, tỉ lệ sống sót cao, có thể điều chỉnh tỉ lệ đực cái theo ý muốn đặc biệt là sinh đôi.

C. bộ nhiễm sắc thể có số lượng ít, đơn giản về cấu trúc nên rất thuận lợi trong việc nghiên cứu di truyền

D. những đặc điểm sinh lí, hình thái ở người đã được nghiên cứu toàn diện nhất so với bất kì sinh vật nào khác

Mark the letter A, B, C, or El on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

Smallpox is a dangerous disease. Malaria is a dangerous disease.

A. Smallpox is a dangerous disease, and so is malaria.

B. Malaria is a dangerous disease, but smallpox is not.

C. Neither smallpox nor malaria is a dangerous disease.

D. Either smallpox or malaria is a dangerous disease.

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 36 to 42.

In the 1960s, The Beatles were probably the most famous pop group in the whole world. Since then, there have been a great many groups that have achieved enormous fame, so it is perhaps difficult now to imagine how sensational The Beatles were at that time. They were four boys from the north of England and none of them had any training in music, They started by performing and recording songs by black Americans and they had some success with these songs, Then they started writing their own songs and that was when they became really popular. The Beatles changed pop music. They were the first pop group to achieve great success from songs they had written themselves. After that it became common for groups and singers to write their own songs. The Beatles did not have a long career. Their first hit record was in 1963 and they split up in 1970. They stopped doing live performances in 1966 because it had become too dangerous for them - their fans were so excited that they surrounded them and tried to take their clothes as souvenirs! However, today some of their songs remain as famous as they were when they first came out Throughout the world many people can sing part of a Beatles song if you ask them.

The Beatles stopped their live performances because

A. They had earned enough money

B. They did not want to work with each other

C. They spent more time writing their own songs

D. They were afraid of being hurt by fans