考研英语阅读模拟题(1)_第2页

　　[C] Therapeutic genes are carried by harmless viruses.

　　[D] Gene-doping is encouraged by world agencies to help athletes get better scores.

　　4. The word “tarnish” (line 5， paragraph 4) most probably means ____________.

　　[A] affect

　　[B] warn

　　[C] trouble

　　[D] stain

　　5. From the text we can see that the author seems ___________.

　　[A] optimistic

　　[B] pessimistic

　　[C] troubled

　　[D] uncertain

　　答案：A B C D A