l Human insulin(胰岛素)-- for the treatment of diabetes. People with diabetes used to rely on a beef- or pork-based product until 1982. Now insulin can be manufactured by genetically altered bacteria.
Advances in genetic engineering have continued, though they constantly must be weighted against the safety of procedures. There is clearly much more to discover.
31. This passage is mainly about
A. the effects of altering cells.
B. the human growth hormone.
C. insulin resistance.
D. U.S. Supreme Court rulings.
【参考答案】:A
32. Genetic enginerring may be defined as
A. the altering of normal cell reproduction
B. a branch of applied chemistry.
C. a procedure that holds little promise.
D. a study on life-saving enzymes.
【参考答案】:A
33. According to the passage, human interferon
A. is a hormone that causes disease.
B. could be used to treat cancer.
C. is a viral disease
D. has been cured
【参考答案】:B
34. In this passage, the three genetically engineered medical products are presented
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