单项选择题

The number about reported thefts and convictions is used to illustrate that ______.

A．thefts have decreased considerably
B．crime does not pay
C．crime rate has risen
D．legal deterrents are not strong
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单项选择题
The sharp rise of the snow geese population is mainly caused by ______.
A．lack of natural enemies
B．great care of wildlife preservationists
C．favorable conditions in their winter habitat
D．changes in their migration patterns
单项选择题
The Chickscope Project enabled students to do all of the following EXCEPT ______.
A．to set up an incubator to hatch chicks
B．to actually operate an MRI system
C．to get involved in actual research
D．to watch the changes in the chick embryo
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