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人手指意外触到蜡烛火焰，引起屈肘反射。其反射弧示意图如下图。 图中神经元a产生的兴奋在传入神经纤维上以（）形式进行传导。当神经冲动传到神经末梢时，引起突触前膜内（）释放神经递质，该递质与神经元b细胞膜上（）结合，使神经元b兴奋。神经元b的神经冲动进一步引起神经元c兴奋，最终导致屈肌收缩。
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A.
No hurry
B.
No way
C.
No problem
D.
No chance
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【单选题】Every morning Mr. Smith takes a ______ to his office.
A.
20 minutes’ walk
B.
20 minute’s walk
C.
20-minutes walk
D.
20-minute walk
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【单选题】It takes her about 20 minutes _______to school.
A.
get
B.
gets
C.
getting
D.
to get
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【单选题】It only __________ him 20 minutes __________ to his office every day.
A.
takes; to  drive
B.
took; drive
C.
takes; drive D  takes took
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A.
正确
B.
错误
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【单选题】Fifty years ago, most people lived in rural areas. But the world has changed. In the near future, more than half of all people will live in cities for the first time in history. City life is not alway...
A.
urbanization and its effects
B.
a huge effect of human
C.
economic development
D.
the environment
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【单选题】Tom______half an hour doing his homework and listening to pop music ______him 20 minutes.
A.
costs; spends
B.
spends; take
C.
takes; costs
D.
spends; takes
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【单选题】It takes Mr Wang 20 minutes lunch every day.
A.
、 cook     
B.
、 to cook     
C.
、 cooking     
D.
、 cooks
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【单选题】It _______ me 20 minutes _______ to the park.
A.
spends ; to walk
B.
spends ; walking
C.
takes ; to walk
D.
takes ; walking
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【单选题】Tom takes 20 minutes to cook an egg and 5 minutes to make a sandwich. Jerry takes 15 minutes to cook an egg and 3 minutes to make a sandwich. Tom has a comparative advantage in ________ and Jerry has ...
A.
cooking eggs; making sandwiches
B.
making sandwiches; cooking eggs
C.
neither of these activities; both activities
D.
both activities; neither of these activities
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相关题目：
【单选题】— Hurry up!It's already 8:20. — ________ ! It takes only 20 minutes to get to the station and the train doesn't leave until 9:20. [     ]
A.
No hurry
B.
No way
C.
No problem
D.
No chance
查看完整题目与答案
【单选题】Every morning Mr. Smith takes a ______ to his office.
A.
20 minutes’ walk
B.
20 minute’s walk
C.
20-minutes walk
D.
20-minute walk
查看完整题目与答案
【单选题】It takes her about 20 minutes _______to school.
A.
get
B.
gets
C.
getting
D.
to get
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【单选题】It only __________ him 20 minutes __________ to his office every day.
A.
takes; to  drive
B.
took; drive
C.
takes; drive D  takes took
查看完整题目与答案
【判断题】已选择执行《企业会计准则》的小企业，不得在执行《企业会计准则》的同时，选择执行《小企业会计准则》的相关规定。( )
A.
正确
B.
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【单选题】Fifty years ago, most people lived in rural areas. But the world has changed. In the near future, more than half of all people will live in cities for the first time in history. City life is not alway...
A.
urbanization and its effects
B.
a huge effect of human
C.
economic development
D.
the environment
查看完整题目与答案
【单选题】Tom______half an hour doing his homework and listening to pop music ______him 20 minutes.
A.
costs; spends
B.
spends; take
C.
takes; costs
D.
spends; takes
查看完整题目与答案
【单选题】It takes Mr Wang 20 minutes lunch every day.
A.
、 cook     
B.
、 to cook     
C.
、 cooking     
D.
、 cooks
查看完整题目与答案
【单选题】It _______ me 20 minutes _______ to the park.
A.
spends ; to walk
B.
spends ; walking
C.
takes ; to walk
D.
takes ; walking
查看完整题目与答案
【单选题】Tom takes 20 minutes to cook an egg and 5 minutes to make a sandwich. Jerry takes 15 minutes to cook an egg and 3 minutes to make a sandwich. Tom has a comparative advantage in ________ and Jerry has ...
A.
cooking eggs; making sandwiches
B.
making sandwiches; cooking eggs
C.
neither of these activities; both activities
D.
both activities; neither of these activities
查看完整题目与答案