句型转换。

1. Why don't you go boating on the river? (改为同义句)

  ______  ______ go boating on the river?

2. Bill sat next to him in the classroom. (改为一般疑问句)

  ______ Bill ______ next to him in the classroom?

3. My sister is helping my mother wash clothes now. (用just now替换now)

  My sister _____ my mother wash clothes ______  ______.

4. Please tell me, "Why does Sally miss her parents?" (连成含宾语从句的复合句)

  Please tell me ______  ______  _______  ______  _______.

5. I wanted to know, "Is he doing his homework?"  (连成含宾语从句的复合句)

  I wanted to know ______  ______  _______  _______ his homework.

关于药液过滤，以下描述错误的是（）。

A.药液直接添入药箱即可，无需过滤

B.水泵进液口需过滤网进行过滤，否则将有可能导致水泵损坏

C.压力喷头进液口需进行过滤，否则将引起喷头堵塞

D.过滤网的密度应与喷头喷雾直径相适应