（5分）KNO₃和NaCl在不同温度时的溶解度如下表所示。请回答下列问题：

图中能表示KNO₃溶解度曲线的是            （填“A”或“B”）

（2）由表中数据分析可知，KNO₃和NaCl在某一温度时具有相同的溶解         度，则温度的范围是                          ；

（3）某兴趣小组做了一下实验：

上述实验过程中得到的溶液一定属于不饱和溶液的是                   （填数字序号），将⑤继续冷却至10℃，过滤，共可回收得到KNO₃固体                 g；

（4）硝酸钾中含有少量氯化钠时，可通过                   （填“蒸发结晶”或“降温结晶”）的方法提纯。

Sometimes we have specific problems with our mother; sometimes, life with her can just be hard work. If there are difficulties in your (1) , it’s best to deal with them, (2) remember that any (3) should be done (4) person or by letter. The telephone is not a good (5) because it is too easy (6) either side to (7) the conversation.

Explain to her (8) you find difficult in your relationship and then (9) some new arrangements that you think would establish a (10) balance between you. Sometimes we hold (11) from establishing such boundaries because we are afraid that doing (12) implies we are (13) her. We need to remember that being (14) from our mother does not (15) mean that we no longer love her. If the conflict is (16) and you cannot find a way to (17) it, you might decide to give up your relationship with your mother for a while. Some of my patients had (18) "trial separations". The (19) allowed things to simmer down, enabling (20) .

（9）（）

A.propose

B.perform

C.remove

D.outline