◎ 题干
According to the air traffic rules, you ____ switch off your mobile phone before boarding.

[     ]

A. may
B. can
C. would
D. should
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“看图填空。Thisismyface. Ihave ________ nose.Ihave ________ mouth.Ihave ________ eyes.Ihave ________ears. Word list:one,two…”主要考查了你对  【情态动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。