1990年，“欧共体12国在养老金和医疗保健方面的亏空就高达7.5万亿欧洲货币单位，相当于同年欧共体国内生产总值的14.5%”。导致这一现象的原因是

从方框中选择合适的选项补全对话。

A: Where have you been, Li Hai? I called you, but you weren't in.

B: ____

A: ____

B: I found that the factory was pouring waste water into the river near it. Lots of fish have died.

A: ____

B: Do you think “Greener China” can do something?

A: ____ if they know about this thing, they will prevent it. Let's write to them at once.

B: ____ I think everything will become better.

A. What did you do there? B. Good idea. C. Yes, of course D. That's terrible. E. I've been to a chemical factory

读图，回答下列各题。

做铁丝在氧气中燃烧的实验时，要先点燃铁丝上系着的火柴，再伸入集气瓶中，火柴燃烧的作用是（   ）

根据表格内容，选择最佳答案。    How time flies! The 9th graders are going to graduate soon. We invite them to write about their school memories.
    Let's share some of them.             
—Ms. Rosen
Name: Brita
Favourite memory: Moving to this school last year and meeting new friends. Unpleasant memory: Being the “new girl”. Favourite teacher: Ms. Rosen. I like her interesting classes. Advice: School can be fun if you do your best.Name: Jay
Favourite memory: School trips. Singing competitions. Unpleasant memory: Project homework. Favourite teacher: Ms. Williams. She treats every student equally. Advice: Work hard and fun will come.Name: Rocky
Favourite memory: Meeting new friends. The weekends. Unpleasant memory: Tests. Favourite teacher: Mr. Taylor. He helps me with my lessons. Advice: Once you fall behind, keep trying till you catch up.Name: Angel
Favourite memory: Being with new people. Fun classes. Unpleasant memory: The loss of a new watch. Favourite teacher: Ms. Rosen. She helped me through hard times. Advice: Hard work brings success.