问题
选择题
Both Jim and Kate _____ in Beijing now. They both _____ from America. [ ]
A. is ; come
B. are ; come
C. is ; comes
D. are ; comes
答案
答案：B
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Both Jim and Kate _____ in Beijing now. They both _____ from America. [ ]
A. is ; come
B. are ; come
C. is ; comes
D. are ; comes
答案：B
KCl是一种常用的钾肥，其溶解度如下表。下列说法正确的是 （ ）
| 温度／℃ | 0 | 20 | 40 | 60 |
| 溶解度／g | 27．6 | 34．0 | 40．0 | 45．5 |
A．KCl饱和溶液中不能再溶解其他物质
B．40℃时KCl饱和溶液的质量分数为40.0％
C．20℃时，100 g KCl饱和溶液中含KCl 34．0 g
D．60℃的KCl饱和溶液降温至20℃，有晶体析出