A. immigration
B. Puerto Rican cuisine
C. Caribbean history
D. the islands natural beauty
38、what is the main idea of the second paragraph?
A. Taino dishes are important in Puerto Rican cooking
B. Puerto Rican cooking has many outside influences
C. Food imported by foreigners isnt really Puerto Rican
D. African foods have probably had the most influence
39、How is sofrito used?
A. It is eaten before meals
B. It is added to other dishes
C. It is used where foods are too spicy
D. It is eaten as a main dish
40、which of the following is NOT true?
A. Many people think Puerto Rican food is spicy
B. Puerto Rican cuisine uses a lot of chili peppers
C. softito is a type of extremely spicy food
D. Aij caballero is a type of chile pepper
第三篇 Genetic Engineering
Genetic engineering began when the DNA molecule(分子), the most basic unit of life, was first described in 1953 by James Watson and Francis Crick. An understanding of DNA led to the altering of normal cell reproduction. Experiments with altering human cells began in 1970. In one of the first experiments, patients were injected with a virus that would produce a life-saving enzyme, but their bodies would not accept it. In 1980 patients with a rare but fatal blood disease were injected with a purified gene that was cloned through DNA technology. Another failure.
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