单项选择题

There is no question that impure air is a health problem of great and increasing importance.

A)不洁空气正在严重地而且越来越严重地威胁着人们的健康，这是毫无疑问的。
B)毫无疑问，空气污染对人们的健康具有很大的危害，而且这种危害越来越严重。
C)不洁空气对健康产生着越来越严重的威胁的问题是不存在的。
D)空气污染极大地危害了人们的健康，这引起人们越来越多的重视。
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In carrying out your budget, you need .
A．to have the ability to control yourself
B．to ask your family members for advice
C．to cut it down as much as possible
D．to take care not to buy expensive things
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A．Yes, I live here.B．Yes, it’ s the railway station.C．No, it’s not very far’.D．20 minutes’ walk.
A．Yes, I live here.
B．Yes, it’ s the railway station.
C．No, it’s not very far’.
D．20 minutes’ walk.
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