A-A+
In the last sentence scientists can only poin
问题详情
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 ______.
A．cloak
B．guard
C．defend
D．protect请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：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。
