单项选择题

A. Keep it waterproof.
B. Keep it cool in summer.
C. Communicate with other birds of the same species.
D. Allow it to fly.
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单项选择题
A. The British government. B. George Washington.C. Ben Franklin. D. The private contractors.
A. The British government.
B. George Washington.
C. Ben Franklin.
D. The private contractors.
单项选择题
A. Places the woman has visited.B. A paper the woman is writing for a class.C. School activities they enjoy.D. The man’s plans for the summer.
A. Places the woman has visited.
B. A paper the woman is writing for a class.
C. School activities they enjoy.
D. The man’s plans for the summer.
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