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单项选择题

A.It enables children to live better.
B.It goes down during economic recession.
C.It often rises higher than inflation.
D.It has gone up 25% in the past decade.
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单项选择题______ from his family for a long time, Mark was very worried about them.

A. Not hearing
B. Not having heard
C. Not to hear
D. To have not heard

单项选择题A.They cannot see the firefighters because of the smoke. B.They do not realize the danger they are in. C.They cannot hear the firefighters for the noise. D.They mistake the firefighters for monsters.

A.They cannot see the firefighters because of the smoke.
B.They do not realize the danger they are in.
C.They cannot hear the firefighters for the noise.
D.They mistake the firefighters for monsters.