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【判断题】
社会治理的重心必须落到城乡社区，社区服务和管理能力强了，社会治理的基础就实了。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following is an accurate statement about the pull of the sun on the earth?
A.
It determines the time of high tide.
B.
It is about twice the pull of the moon.
C.
It determines the time of low tide.
D.
It is about half the pull of the moon.
【简答题】桔梗横切面可见（ ）
【简答题】桔梗横切面可见（ ）。
【单选题】What does the experiment lnentioned in paragraph 4 prove? 查看材料
A.
There are more enzymes in decaf drinkers' urine sample.
B.
There are more melatonin concentrations in caffeine drinkers' urine sample.
C.
Decaf drinkers produce less melatonin.
D.
Caffeine drinkers produce less sleep hormone that decaf drinkers.
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