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【单选题】
Why did Sam mention Nest's failure in Africa?A.
Because he wanted to prove the importance of a thorough feasibility investigation before taking any of the recommended options.
B.
Because the main problem in Central and South American markets is poor health conditions.
C.
Because he wanted to arrange another longer visit to Brazil or Chile early next year.
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举一反三
【单选题】抑制性突触后电位的产生，是由于突触后膜对下列哪种离子提高了通透性
A.
钠离子、钾离子，尤其是对钾离子
B.
钙离子、钾离子，尤其是对钙离子
C.
钠离子、钾离子，尤其是对钠离子
D.
钾离子、氯离子，尤其是对氯离子
E.
钾离子、钙离子，尤其是对钙离子
【单选题】抑制性突触后电位产生是由于突触后膜对哪种离子通透性升高
A.
Ｎa＋.k＋.Cl-，尤其是k＋
B.
Ｃa２＋.k＋.Cl-，尤其是Ｃa２＋
C.
Ｎa＋.k＋，尤其是Ｎa＋
D.
k ＋ .Cl- ，尤其是Cl-
E.
k ＋ . Ｃa２＋.Ｎa＋尤其是Ｃa２＋
【单选题】.It`s snowing.The temperature is ___quickly.
A.
going down
B.
going off
C.
going up
D.
going out
【单选题】It's snowing.The temperature is quickly.
A.
going down
B.
go down
C.
going up
D.
going out
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