句型转换。根据要求完成下列各句, 每空限填一词。

1. They have three bags of yogurt. (就划线部分提问)

    _________ _________ yogurt do they have?

2. I'll help you if I have time this weekend. (改为同义句)

    I'll help you if I _________ _________ this weekend.

3. My father lived in California last year. (改为否定句)

    My father _________ _________ in California last year.

4. Frank can play soccer. He can also play basketball. (合并成一句)

    Frank can play _________ soccer _________ basketball.

5. You can't pour the milk into the cup. (改为祈使句)

    _________ _________ the milk into the cup!

下列关于浓硫酸的物化性质的叙述中，正确的是（）

①浓硫酸吸水性强，能用作脱水剂、干燥剂

②浓硫酸具有强氯化性，能与许多金属发生氧化还原反应

③稀释浓硫酸时，只能将硫酸沿着器壁慢慢加入水中并不断搅拌

④硫酸的结晶温度是随着浓度的变化而变化的

A.①②③

B.①②④

C.②③④

D.①②③④