研究发现用铝热法可从下列氧化物中冶炼出有关金属，若要得到等物质的量的有关金属单质

根据括号内的要求改写下列句子。

1. I don't know Japanese, so I can't talk to the Japanese. (改为同义句)

    ________ I ________ Japanese, I would talk to the Japanese friends.

2. I was so anxious that I couldn't sleep. (改为同义句)

    I was ________ anxious ________ sleep.

3. He didn't realize the dangers of the situation at all. (改为同义句)

    He didn't realize the dangers of the situation ________.

4. We should allow twenty - year - olds to drive a car. (被动语态)

    Twenty - year - olds ________ to drive a car?

5. If I don't permit, you can't use my dictionary. (改为同义句)

    You can't use my dictionary ________.

职业道德的特点有鲜明的职业性、较强的适用性、（）和相对的稳定性。

A.内容的主观性

B.形式的单一性

C.内容的单调性

D.内容和形式的多样性

生产损失

哪项不是心脏病孕妇发生心力衰竭的诱因？（）

A.妊娠32～34周心排血量明显增加

B.妊娠末期血容量增加达高峰

C.妊娠6周始心率平均增加10次／分

D.妊娠早期以心排血量增加为主

E.妊娠后期子宫增大心脏机械性负担

一旅客持有一张N556次（广州至岳阳）广州至株洲的空客特快有效车票在株洲出站时要求退票，该车于韶关开车后空调机发生故障未能修复，车长编记录交旅客，应退还（）。

A.广州至株洲空调票价减广州至韶关空调票价，不收退票费

B.韶关至株洲空调票价，核收退票费

C.广州至株洲空调票价减广州至韶关空调票价，核收退票费

D.韶关至株洲空调票价，不收退票费