试题与答案

为了鼓励市民节约用水,规定自来水的收费标准如下表:每月每户用水量每吨价(元)不超

题型:解答题

题目:

为了鼓励市民节约用水,规定自来水的收费标准如下表:
每月每户用水量每吨价(元)
不超过10吨的部分2.00
超过10吨而不超过20吨的部分3.00
超过20吨的部分5.00
(1)请分类讨论每月每户的水费(y)与用水量(x)之间的数量关系式.
(2)如果四月份用水量为23吨,则应缴纳水费多少元?
(3)如果五月份缴纳水费90元,则用水多少吨?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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题型:阅读理解

C

Sitting in a dark movie theater with your friends. and a tub of popcorn (H^) sounds like a perfect way to spend a Saturday night, and it could be, if you are willing to share your popcorn with the entire row of moviegoers around you.

A review of movie-theater popcorn reveals an alarming amount of fat, salt and calories in even the smallest sizes. A large tub of popcorn at Regal Cinemas, for example, holds 20 cups of popcorn and has 1,200 calories, 980 milligrams of sodium (钠) and 60 grams of saturated (饱和的) fat. Adding just a tablespoon of butter adds 130 calories. And do not forget that it comes with free refills.

Not so hungry? The medium size popcorn, even the small, at 11 cups, delivers 670 calories, 550 milligrams of sodium .and 24 grams of saturated fat. The findings may surprise those who believe it is a relatively healthy snack. In fact, plain air-popped popcorn is low in calories and free of saturated fat. Movie theater popcorn, however, is popped in oil, often coconut oil, which is 90 percent saturated fat. Add salt to it, and your once-healthy snack turns into a health offender.

One way to make your popcorn healthier? Ask the theater to pop the corn without salt. The best way to make your movie snack healthier, however, would be to skip the popcorn.

"You could share a tub of popcorn with 10 friends," Dr. Nestle, a professor of nutrition at New York University, said. "Or, what a concept, watch the movie without eating anything."

64. The review finds that movie theatre popcorn may contain all the following EXCEPT ______.

A. butter           B. sodium                 C. saturated fat         D. pepper

65. What does the author think of popcorn prepared in coconut oil?

A. It is a healthy snack.                        B. It does harm to our health.               C. It looks like a perfect choice.                 D. It is very nutritious.

66. Which kind of popcorn causes the least health concern?

A. Movie theatre popcorn.                                 B. Popcorn sold at Regal Cinemas.          C. Large size popcorn.                                      D. Plain air-popped popcorn.

67. What is Dr. Nestle's suggestion to moviegoers?

A. Avoid eating popcorn.                                  B. Share popcorn with friends.              C. Not eating anything in the movie theatre.          D. Try eating other kind of food.

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