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【单选题】
下列各组微粒中，核外电子总数相等的是A.
Na ＋ 和Li ＋
B.
H 2 O和H 3 O ＋
C.
CO和CO 2
D.
NO和CO
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反馈参考答案：
举一反三
【单选题】Why doesn't Len buy a tie?
A.
He doesn't like the colors of them.
B.
They are very expensive.
C.
He has many ties.
D.
It is difficult for him to choose them.
【简答题】（满分8分）计算：( ) -1 - 2sin 45°+ |1- |．
【简答题】下图是我国某区域图，读图回答下列各题。 小题1:与图中M河比较，N河 A．径流量更大 B．含沙量更大 C．落差更小 D．冰期更短 小题2:与东南沿海地区比较，图中东西向铁路干线沿线地区工业发展的优势是 A．劳动力丰富 B．矿产丰富 C．技术力量雄厚 D．市场广阔
【单选题】–Why don’t you choose the red tie? --For me, it doesn’t _________ my shirt very well.
A.
fix
B.
accept
C.
compare
D.
match
【单选题】Why doesn't the man buy a tie?
A.
He doen't like them.
B.
They are too expensive.
C.
He has many ties.
D.
They are not his type.
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