(单选题)

59. （）

A.demonstrating on

B.looking at

C.using by

D.seeing at

参考答案：B

参考解析：

考查动词短语辨析。句意：观看桌面显示器超过两个小时“会抑制我们体内褪黑激素的水平，因为这些设备会发出短波长的光辐射”——换句话说，它们会发出更蓝的光。demonstrate意为“演示”；look at意为“看”；use意为“使用”；see意为“观看（比赛、电视节目、演出等）”。根据句意和选项的用法可确定答案为B。故选B。

知识点：有选项完形填空英语专业基础知识完形填空教师招聘-小学英语

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