问题 填空题

下列措施有利于防止铁制品锈蚀的是(  )

A.农具上的铁锈没有及时除去

B.切过酸菜的菜刀不及时清洗

C.工地上的钢管堆放在潮湿的地方

D.剪刀不用时涂上油并放在干燥处

答案

答案:D

本题考查考生对铁制品如何防锈的认识。解答本题需明确两点:(1)知道铁制品生锈的条件;(2)明确如何才能防止铁制品生锈。生了锈的铁制品若不及时处理,铁锈会吸收空气中的水蒸气和氧气,使锈蚀更为严重,所以铁锈要及时除去;菜刀的主要成分铁属于活泼金属,能与酸反应,切过酸菜的菜刀不及时清洁,会加速菜刀的锈蚀;为了防止铁制品生锈,应将铁制品放在干燥的地方,故A、B、C都不利于防止铁制品生锈;剪刀不用时涂上油,隔绝了氧气,放于干燥处不能与水接触,剪刀不满足生锈的条件,故D正确。

阅读理解

阅读下面短文,从每题所给的四个选项中,选出最佳答案。

Hi, dear boys and girls! Do you know how to be a healthy kid? Here are some rules you should follow.

First, eat different foods, especially fruit and vegetables. You may have a favorite food, but you'd better eat something different, if you eat different foods, you will probably get more nutrients (营养物质) your body needs.

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

Next, listen to your body. How do you feel when you are full? When you are 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 fat.

Afterwards, limit (限制) 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.

Finally, 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.

Follow these rules and you can be a healthy kid.

小题1:You have to eat different kinds of foods especially _________.

A.meat

B.hamburgers 

C.sweets

D.fruit and vegetables小题2:Which kind of drinks can give you more calcium?

A.Juice.  

B.Milk.

C.Cold water.

D.Tea.小题3:According to the passage, how many rules should you follow if you want to be healthy?

A.Five.  

B.Nine.     

C.Fifteen.

D.Thirteen.小题4:According to the passage, which of the following is TRUE?

A.When you're eating, you don't have to pay attention to how your body feels.

B.You can eat your favorite food as much as you can .

C.You can watch TV whenever you like to get more information.

D.We should try to live in an active way in our life.小题5:Which is the best title of the passage?

A.How to make yourself popular

B.How to be a healthy kid

C.How to be a popular kid

D.How to make your parents healthy

单项选择题