问题 单项选择题

某家庭某年一月份、二月份、三月份的煤气用量分别为4立方米、25立方米、35立方米,支付一月份、二月份、三月份的煤气费分别为4元、14元、19元。如果该市煤气费收费的方法是:煤气费=基本费用+超额费用+保险费,且若每月用气量不超过最低限度A立方米时,只收基本费用3元和每户每月定额保险费C元;若用气量超过A立方米,则超过的部分每立方米收取B元。保险费不少于1元。若某用户四月份用气32立方米时,该用户这年四月份应该交纳的煤气费用是多少元

A.16

B.16.5

C.17

D.17.5

答案

参考答案:D

解析: 由一月份煤气费用为4元可知保险费C=4-3=1元,则可得方程组:3+(25一A)×B+1=14,3+(35-A)×B+1=19,解得A=5,B=0.5,故四月份应付煤气费为3+(32-5)×0.5+1=17.5元。

阅读理解

It’s not always easy to eat healthy foods when others seem to eat whatever they want. Follow the tips and know that it will make a difference in your life.

What about sweet foods?

Everyone likes the taste of sweet foods! Small amounts of sweet foods can be part of a healthy meal plan. Sugary foods include soda, sweetened fruit drinks, honey, and candy. Desserts such as cakes, pies, cookies, and ice cream contain a lot of fat as well as sugar. If you choose to eat any of these sweet foods, just have a small amount at the end of a healthy meal. Have a piece of fruit if you are still hungry. Drink water, sugar-free soda, and sugar-free fruit drinks, if you are thirsty, instead of drinks that are all high in sugars.

How much should you eat?

Your height, weight, age, whether you are a boy or a girl, and how active you are will affect how much food you need to eat each day to stay at a healthy weight. Everyone is different. Talk to your doctor or diet expert about how much to eat, especially if you need to lose weight. If you take in more food than your body burns, you will gain weight. If you take in less food than your body burns, you will lose weight. Being active and eating smaller amounts of food and fewer sweet or fatty foods can help overweight kids lose weight in a healthy way. You will keep your heart healthy, too.

67.Which of the following desserts is NOT mentioned in the passage?

A.Cakes.                     B.Pies.                        C.Cheese.                           D.Cookies.

68.How much we should eat will depend on the following EXCEPT___________.

A.our body size                      

B.the time we spend taking exercise

C.how old we are             

D.the money our family earns

69.According to the passage, which of the following statements is TRUE?

A.The more food our body burns, the faster we will lose weight.

B.The more food we eat, the more food our body will burn.

C.The more active we are, the more food we need to eat.

D.The more food we eat, the more weight we will gain

70.The author advises overweight children to_________.

A.eat healthy foods and take regular exercise

B.pay much attention to their heart health

C.keep foods containing sugar and fat away

D.talk to their doctor and join a health club

填空题