2. 外语
  3. The best title for this passage would be ______? In the sentence "Because humans are at the top of the food chain, they are par

The best title for this passage would be ______? In the sentence "Because humans are at the top of the food chain, they are par

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问题 The best title for this passage would be ______?
In the sentence "Because humans are at the top of the food chain, they are particularly vulnerable to the effects of nondegradable pollutants.", "vulnerable" probably means ______.
选项 A、defenseless
B、protected
C、strong
D、fragile
答案A
解析 这个问句的意思是“因为人类在食物链的顶部，对于不能分解的污染物(食用)他们尤其脆弱。”根据 A项“无防御的”、B项“保护的”、C项“强壮的”、D项“易碎的”来看，A项比较合适。
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