—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．helpless
C．harmfulD．harmless

C

解析試題分析：句意：許多年輕人喜歡在晚上關(guān)燈以后用手機(jī)看小說。難道你們不認(rèn)為那對他們的眼睛有害嗎？A. helpful“有幫助的”；B. helpless“無助的”；C. harmful“有害的”；D. harmless“無害的”。結(jié)合句意，故選C。
考點(diǎn)：考查形容詞的辨析。

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