罗森塔尔借用古希腊神话的典故，把教师期望的______称为皮格马利翁效应。

Questions 23-30
· You will hear people from the National Food Council complaining to retailers about the high prices they are charging for food products and household goods. They complain that the shops have marked up wholesale prices far too much.
· For each question (23-30), mark one letter (A, B or C) for the correct answer.
· After you have listened once, replay the recording.

The National Food Council has studied

A．

B．

C．

— Shall I offer you a ride as you live so far away?

— Thank you. ______. [ ]

A. It couldn't be better

B. Of course you can

C. If you like

D. It's up to you

冷战时期

甲物质在水中的溶解度曲线如右图所示，a、b、c为图像中的三个点。

（1）t₁℃时将20g甲物质溶解在50g水中，所得溶液的质量为______g。

（1）若将b点溶液从t₂℃降温至t₁℃，该溶液变为  ___    _   ___

(填“饱和”或“不饱和”)溶液，该溶液的溶质质量分数__   ___

(填“变大”、“变小”或“不变”)，若将b点溶液变为c点溶液，

除恒温蒸发溶剂外，还可采用_                          _的方法。

下面不适宜叶面喷肥的时间是（）。

A.上午10点以前

B.下午4点以后

C.中午