问题 选择题

据报道,人工光合作用能够借助太阳能,用CO2和H2O制备HCOOH,其反应原理如下:2CO2+2H2O 2HCOOH+O2,下列说法正确的是

A.HCOOH分子中含有极性键,又有非极性键

B.反应中,CO2被氧化,O2是还原产物

C.反应中,每转移4×6.02×1022个电子,生成2.24L气体

D.该过程是将太阳能转化为化学能的过程

答案

答案:D

题目分析:A、同种元素之间形成非极性共价键,该分子中没有非极性共价键,错误;B、O\从-2到0,发生氧化反应,为氧化产物,错误;C、产生气体的状况,没有标明,不能确定其体积,错误;D、正确。

阅读理解

Do you know how to be a healthy kid? Here are some rules you should follow.

First, eat different food, especially fruits and vegetables. You may have a favorite food, but you’d better eat something different. If you eat diff You can’t watch TV for more than two hours a day errant food, you will probably get more nutrients (营养物质) your body needs.

Second, drink water and milk as often as possible. When you are really thirsty, cold water is the No. 1 choice. Milk is a great drink that can give you more calcium (钙) your body needs to grow strong bones.

Third, listen to your body. How do you feel when you are ill? When you’re eating, notice how your body feels and when your stomach feels comfortably full. Eating too much will not make you feel comfortable and make you feel fat.

Fourth, limit screen time. Screen time is the time you watch TV, DVDs and videos, or using computers. It is good to take more exercise such as basketball, bike riding and swimming. You can’t watch TV for more than two hours a day.

Fifth, be active. One thing you’d like to do, as a kid, is to find out which activity you like best. Find ways to be active every day.

小题1:Which kind of drinks can give you more calcium?

Milk B. Tea C. Juice D. Cold water

小题2:You shouldn’t watch TV for ________ a day.

A.more than two hours

B.less than two hours

C.more than three hours

D.four hours小题3:You should eat different food especially ______________.

A.fish

B.meat

C.sweets

D.fruits and vegetables小题4:According to the passage, you should follow __________ rules if you want to be healthy.

A.four

B.five

C.nine

D.fifth小题5:According to the passage, which of the following sentences is not true?

A.When you are eating, you have to notice how your body feels

B.You can eat your favorite food, but you’d better eat something different

C.You can watch TV for a long time.

D.We should try to live in an active way in our life.

单项选择题