单项选择题

The climate and soil as far north as the Arctic Circle permit farmers to raise livestock and grow barley, potatoes and other crops.

A. help
B. allow
C. require
D. expect
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单项选择题
In the United States, the national flag is usually displayed outdoor between sunrise and sunset.
A. stored
B. folded
C. respected
D. exhibited
单项选择题
According to the science of aerodynamics, the shape of an object influences the amount of drag created by air flowing around it.
A. form
B. size
C. weight
D. interior
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