2. 外语
  3. The best title for this passage would be ______? In the last sentence "scientists can only point out some of the potential impa

The best title for this passage would be ______? In the last sentence "scientists can only point out some of the potential impa

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问题 The best title for this passage would be ______?
In the last sentence "scientists can only point out some of the potential impacts of the decrease of the ozone layer, the protective layer in the atmosphere that shields the earth from the sun’s harmful rays." The word "shield" means ______.
选项 A、cloak
B、guard
C、defend
D、protect
答案D
解析 shield一词的意思是“盾牌”，引申出动词意思“用盾牌阻挡……”→“保护”，因此D项正确。若考生选 B项guard“防护”，也应可选C项defend“防御”，由此看B、C项都应不考虑。
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