题目:
— Have you solved your problem?
— I’ve kept on thinking about that matter__________, but I have had no idea.
A.at times
B.some time
C.at a time
D.all the time
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:空气中含有氮气,而氮气不为人体吸收,故呼出气体含有氮气;呼出的气体使燃着的木条熄灭,说明呼出的气体中含氧气少;呼出的气体使澄清石灰水更浑浊,说明呼出气体含二氧化碳多;呼出的气体在玻...