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【单选题】
溶液稀释所遵循的原则A.
溶液稀释前后密度相等
B.
溶液稀释前后物质的量浓度相等
C.
溶液稀释前后质量浓度相等
D.
溶液稀释前后物质的量相等
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皮皮学刷刷变学霸
举一反三
【单选题】It was no surprise that an awful accident ____ occur the day when they were drunk．
A.
does
B.
did
C.
has to
D.
had to
【单选题】It was quite a surprise to many that he should have been awarded the literary prize for the science fiction about an invasion of ________.
A.
creatures
B.
dupes
C.
chariots
D.
aliens
【单选题】---If you like the new house, I suggest you buying it. ---But it's really too expensive. I can't______ it.
A.
get
B.
afford
C.
supply
D.
support
【简答题】It was really a pleasant surprise to her marriage. 闻知其婚讯,喜出望外。
【简答题】给出下列四个命题： ①已知集合A?{1，2，3，4}，且A中至少含有一个奇数，则这样的集合A有12个； ②任意的三角形ABC中，有cos2A＜cos2B的充要条件是A＞B； ③平面上n个圆最多将平面分成2n 2 -4n+4个部分； ④空间中直角在一个平面上的正投影可以是钝角； 其中真命题的序号是______（要求写出所有真命题的序号）．
【单选题】My dad was_ ▲when he saw me__ ▲_ it when it was supposed to be a surprise.
A.
shocking; putting on .
B.
shocking; wearing
C.
shocked; wearing
D.
shocked ; putting on
【单选题】—Can my lost wallet be found? —I'm not sure. But I _____someone will return it later. [ ]
A.
suggest
B.
know
C.
expect
D.
advise
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