问题
不定项选择题
在化学变化中，一定改变的是[ ]
A．元素的化合价
B．分子的种类
C．原子的种类
D．反应前后物质的总质量
答案
答案：B
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在化学变化中，一定改变的是[ ]
A．元素的化合价
B．分子的种类
C．原子的种类
D．反应前后物质的总质量
答案：B
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| Bill likes football very much, and he often goes to matches in our 1 on Sundays. He doesn't go to the best seats, 2 they are very 3 . There was a big football match in our town last Sunday. 4 it was very cloudy, but then the sun 5 , and it was very hot. There were a lot of people on benches 6 Bill at the match. Bill was on one bench and there 7 a fat man on a bench behind him. At first the fat man was cold, 8 then he was very hot. He took his coat off and put it in front of him, but it fell on Bill's head. Bill was not angry. He took the coat 9 his head, looked at it and then. laughed and said, "Thank you. but 10 are the trousers?" | |||
| ( )l. A. village ( )2. A. so ( )3. A. dear ( )4. A. At that time ( )5. A. went down ( )6. A. in front of ( )7. A. was ( )8. A. or ( )9. A. away ( )10.A. how | B. town B. if B. cheap B. Then B. was away B. behind B. had B. but B. from B. when | C. country C. because C. nice C. The first C. came out C. around C. was going to be C. and C. on C. whose | D. home D. but D. high D. At first D. came down D. near D. would be D. so D. off D. where |