问题
选择题
This dictionary______ Tom's. It has Ann's name on it.[ ]
A. might be
B. may he
C. can't be
答案
答案：C
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This dictionary______ Tom's. It has Ann's name on it.[ ]
A. might be
B. may he
C. can't be
答案：C
下表：是NaCl、NH4Cl在不同温度时的溶解度．
| 温度/℃ | 0 | 20 | 40 | 60 | 80 | |
| 溶解度/g | NaCl | 35.7 | 36.0 | 36.6 | 37.3 | 34.8 |
| NH4Cl | 29.4 | 37.2 | 45.8 | 55.2 | 65.6 | |
（2）20℃时，将40gNaCl加入到100g水中充分搅拌后，所得溶液的质量为______g．
（3）40℃时，要使接近饱和的NH4Cl溶液变为饱和溶液，下列方法中一定能达到目的得是______（填序号）．
①升高温度 ②加溶质NH4Cl ③加水 ④恒温蒸发水．