皮皮学，免费搜题
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【单选题】
猫眼石的化学成分是铍铝氧化物,致色元素是( )?A.
铬
B.
钒
C.
铁
D.
氧化铬
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知识点：
皮皮学刷刷变学霸
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【单选题】Thank god，you finally returned home ________.You can never imagine how I worried about you when I was told about the terrible accident.
A.
safely
B.
safe
C.
separately
D.
cleverly
【单选题】下列关于中枢抑制的叙述,错误的是
A.
突触后抑制包括传入侧支性抑制和回返性抑制
B.
突触前抑制的结构基础是轴突-轴突式突触
C.
突触后抑制通过产生IPSP对突触后神经元产生抑制
D.
传入侧支性抑制能及时终止神经元的活动
【单选题】He has _______all his strength without doing anything useful.
A.
cost
B.
paid
C.
spent
D.
taken
【单选题】You can't imagine what difficulty we had _________home in the snowstorm. [ ]
A.
walked
B.
walk
C.
to walk
D.
walking
【简答题】3 - + =______．
【简答题】Agriculture was a step in human progress __ which subsequently there was not anything comparable until our own machine age.
【单选题】You can’t imagine what difficulty we had________home in the snowstorm.
A.
walked
B.
walking
C.
to walk
D.
walk
相关题目：
【单选题】He has _______all his strength without doing anything useful.
A.
cost
B.
paid
C.
spent
D.
taken