Don't play games on the computer all day, It's ______ to your eyes.

A. harmful

B. useful

C. helpful

D. thankful

A 【解析】句意：不要整天在電腦上玩游戲，對你的眼睛有害。本題考查形容詞。A. harmful有害的；B. useful有用的；C. helpful有幫助的；D. thankful感激的。根據(jù)句意選A。
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