单项选择题

Although originally a German innovation, kindergarten got its real start in the United States as a movement to provide an improved learning environment for children.

A. an easy
B. a playful
C. an open
D. a better
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单项选择题
The land crab a forest-floor scavenger native to tropical America, migrates to the water to breed.
A. die
B. swim
C. mate
D. hatch
单项选择题
The committee comprises five persons.()

A. absorbs
B. concems
C. excludes
D. involves
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