单项选择题

A．They will have to take a different bus.
B．The trip is too dangerous.
C．They will have to wait.
D．There is a problem with the bus.
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单项选择题
The word colonies ( Line 2, Para. 4) refers to ________.
A．tiny globules
B．watery regions
C．bacteria communities
D．little compartments
单项选择题
Blood cholesterol levels of the Denmark Inuit were lower than those of the Danes.
A．Y
B．N
C．NG
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