20.-Some young people like reading novels on their mobile phones after turning off the light at night.
-Don't you think it is        to their eyes?( 。
A.helpfulB.helplessC.harmfulD.harmless

分析 -一些年輕人喜歡晚上關(guān)燈后在手機(jī)上看小說(shuō).
-你不認(rèn)為這對(duì)他們的眼睛有害嗎?

解答 答案:C
helpful有益的;helpless沒用的;harmful有害的;harmless無(wú)害的;根據(jù)常識(shí)可知晚上關(guān)燈后看手機(jī)對(duì)眼睛有害,故選C.

點(diǎn)評(píng) 本題考查形容詞詞義辨析,先弄清所給詞的詞義,再根據(jù)語(yǔ)境選擇正確答案.

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