单项选择题

57（）

A．risen
B．to rise
C．raised
D．been raising

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单项选择题
According to the passage, birds often half sleep because ______
A．they have to watch out for possible attacks
B．their brain hemispheres take turns to rest
C．the two halves of their brain are differently structured
D．they have to constantly keep an eye on their companions
单项选择题
According to Green Peace spokesman Bryan Bence, the crisis in garbage stem in part from ______
A．the fact that we produce too much garbage
B．the fact that we’ve ignored long-term effect of disposal problems
C．the fact that the world is actually swimming in the garbage
D．the fact that we spend a lot of money disposing the garbage
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