流行性脑脊髓膜炎患儿隔离期从发病之日起不少于（ ）
A．3天
B．7天
C．14天
D．21天
参考答案：B
23. Thousands of years ago, people killed the wild horse that lived around _____ food. _____ time, people began to catch and raise animals .
A．for; Through
B．as; During
C．for; Over
D．on; Over
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