Histocompatibility antigens that attack foreign tissue in the body cannot have b

游客2024-01-10  24

问题 Histocompatibility antigens that attack foreign tissue in the body cannot have been (i)____ through evolution expressly to (ii)____ organ transplantation; on the contrary, they have been found to facilitate many essential biological functions.

选项 A、designed...retain
B、produced…aid
C、developed…enhance
D、selected…promote
E、conserved…foil

答案 E

解析 空格(ii):
- 方程等号:分号,同义重复;cannot取反。
- 强词和时应:分号后强调facilitate,分号前也强调facilitate。空格(ii)对应facilitate根据cannot取反,填入一个负向词。retain保持,aid帮助,enhance增加,promote促进,foil破坏。选项E合适。
空格(i):
- 方程等号:through表示方式方法,同义重复。
- 强词和对应:空格(i)和空格(ii)通过through取同,体现“不促进”。design设计(错),produce生产(错),develop发展(错),select选择(错),conserve保存(对)。综合空格(ii),答案选E。
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