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
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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
单项选择题
Unlike gases, liquids are difficult to compress because there is practically no free space between molecules.
A. In contrast to
B. Similar to
C. More to
D. Just as
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