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卫生部官员希望能在大规模禽流感出现时就能立即消灭该病毒。1918年爆发的一次由禽流感引发的流行病夺走了5000万人的生命......

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在外语习得中，听、说、读、写四种语言技能之间存在着某种平衡。比如，如果某语言学习者词汇量为1000个，那么在阅读中他大概可以使用其中的900个，听力中使用500个，写作中使用300个，口语中使用200个，也就是说，平衡比例为10∶9∶5∶3∶2。这是一种动态平衡。一方面，不同语言学习者所具备的四种技能的比例会有差异。另一方面，我们可以通过加强某一种技能的学习，让其比例上升，但比例中的先后顺序是很难改变的。[听力原文]In foreign language acquisition, there is some kind of balance of proportions among 4 language skills, namely, reading, listening, writing, and speaking. For instance, if a learner has a vocabulary of 1,000, he might be able to use 900 in his reading, 500 in his listening, 300 in his writing and 200 in his speaking. That is to say, the balance is 10: 9: 5: 3: 2. This is a dynamic balance. On the one hand, for different learners, the proportion of each of 4 language skills might be different, and on the other hand, one learner might be able to improve one particular skill which leads to higher proportion for it, but still he can hardly change the order of there proportions.
单项选择题
A． why do people fall asleepB． three kinds of sleep disordersC． the treatment for sleep disordersD． staying up too late can be harmful
A． why do people fall asleep
B． three kinds of sleep disorders
C． the treatment for sleep disorders
D． staying up too late can be harmful
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