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【单选题】
According to the Spanish researchers, which of the following statements is true?A.
The closer you are to a mobile phone, the greater your exposure to electromagnetic radiation.
B.
The closer you are to a mobile phone that is being used to send and receive signals, the greater your exposure to electromagnetic radiation.
C.
The amount of electromagnetic radiation reflected by metal is almost too small to be measured.
D.
You shouldn't stand close to people who are using their mobile phones in train carriages, buses, and lifts.
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举一反三
【判断题】下面这句话语法表达对不对？Jiǔ diǎn le, Shānběn méi yào qǐchuáng le. 九 点 了， 山 本 没 要 起 床 了。
A.
正确
B.
错误
【简答题】高血压的一级预防措施包含哪些内容？
【简答题】ALE 信号的作用是 。
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