Why did the author write this poem？

Why does the author say that nothing was wasted before the invention of fridges？

A．People would not buy more food than was necessary.

B．Food was delivered to people two or three times a week.

C．Food was sold fresh and did not get rotten easily.

D．People had effective ways to preserve their food.

听力原文：M: Have you ever looked really closely at the snowflake？

W: Sure, but they usually melt too fast for me to get a close look. Why do you ask？

M: I'm just curious. I was reading an article about the formation of snowflakes, and I real- ized that I had never paid much attention to them before.

W: WeI1, there is a big variety, isn't there？

M: Yes, but they all have one of the three basic forms: hexagonal columns, thin hexagonal plates and the blanching starshaped form.

W: I wonder why are forms different, maybe because ice starts to form. on dust particles with different shape.

M: Well, I thought it might have something, to do with the water saturation of the air. But we're both wrong. The author of this article did extensive research and concluded that. the shapes of snow crystals largely controlled by the temperature of the air. For example, the featherly star-shaped snowflake that everyone thinks is typical occurs only at a specific temperature.

W: Doesn't the relative humidity has anything to do with the shapes？

M: Apparently not. The effect of super saturation is simply to alter the growth rate. The greater the saturation, the faster the snowflakes form.

W: Why, next time when it snows. I'll make a point of taking a close look.

What are the people discussing？

A．Whether or not snowflakes can be analyzed.

B．How snowflakes are formed.

C．What causes a snowstorm.

D．Where the largest snowflakes can be found.

Why did the author begin to doubt himself after the first year of his writing career？

A．He wasn't about to produce a single book.

B．He hadn't seen a change for the better.

C．He wasn't able to have a rest for a whole year.

D．He found his dream would never come true.

Why did the author almost fall on the floor？ 查看材料

A.Because she had been working too hard.

B.Because she had been deceived.

C.Because she had been tripped.

D.Because she could hardly believe her eyes.

Why did the author offer the AIDS course？

A．He wanted to teach people about a cure for AIDS.

B．People need to be taught how to avoid those with AIDS.

C．He wanted to teach the students that AIDS resulted from moral failure.

D．People take improper attitudes towards AIDS and those with or at high risk of AIDS.

听力原文：M: Why are you eating that apple？

W: It's the only food in the house.

Q: Why did the woman choose the apple？

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A．She prefers apples.

B．She's on a diet.

C．There was nothing else to eat.

D．It's only a snack.

Why does the author say that nothing was wasted before the invention of fridges？

A) People would not buy more food than was necessary.

B) Food was delivered to people two or three times a week.

C) Food was sold fresh and did not get rotten easily.

D) People had effective ways to preserve their food.

听力原文：M: Molly gave Lily flowers yesterday.

W: Molly just did it for Henry.

M: Why did he give flowers

W: It's Lily's birthday yesterday.

M: Are they on date

W: I'm not sure.

Who gave Lily flowers？

A．Molly.

B．Henry.

C．Her boyfriend.

Why did the author say the House’s complaint was ridiculous？[A]The reasons it offers are largely insignificant [B]The Clinton-Nickles bill was too expensive． [C]Its tax cuts proposal is even more costly． [D]The estimated cost for the bill iS Just$5 billion．

A.The heavily loaded van broke down.

B.The van was probably badly damaged.

C.The van had taken too heavy a load.

D.Her mother got seriously injured.