21、Item 1：

    The most common disease in the world is the cold．It often starts with a sore throat．You sneeze and your nose runs．You usually have a headache，too．Often you have a cough later．It's not a serious disease，but you can feel quite bad．There isn't a cure（良药）for a cold，but you can take medicines to make you feel better．For example，you can take aspirin（阿司匹林）to get rid of your headache．It is good to rest，and to drink a lot of water, too．

    Item 2：

    What makes us ill? It is germs（细菌）．Germs are everywhere．They are very small and you can't see them with a microscope．They are very small and there could be hundreds of them on a very small object．Germs are always found in dirty water．When we look at dirty water under the microscope，we can see them．This is why your parents stop you drinking dirty water．

    Item 3：

    It is very important to keep yourself in good health．If you are sick，you can neither study nor enjoy yourself．One of the factors（因素）leading to good health is a balanced diet．You need to eat more fruits and vegetables which contain（包括）a lot of fiber（纤维）．

1．News items l tells us that a cold often starts with                 ．

A．a headache                                              B．a cough

C．a pain in your throat                                   D．feeling a little cold

2．What should we do when we catch a cold?

A．Take a medicine．                                  

B．Have a good rest．

C．Wait for a week．                       

D．Rest，drink a lot of water and take medicine．

3．News item 2 tells us a microscope is used for                     ．

A．making very small things look much smaller

B．making very small things look much bigger

C．helping you read newspapers and books

D．helping you to see more clearly

4．Our parents stop us drinking dirty water because                 ．

A．it can be found almost everywhere

B．it doesn't cost any money to buy

C．there must be lots of germs in it

D．drinking too much water will make us ill

5．From News item 3，we know to stay healthy, one should                 ．

A．eat whenever possible

B．eat food that tastes good

C．have a balanced diet

D．diet to lose weight