题目内容：

You might make a disgusted face when you notice that the person waiting in their car at the red light next to you is picking their nose,but admit it,you do it too.And while it might be the natural option when there isn't a box of tissues around,it can be bad for you.The main reasons people feel the need to pick their nose is to clear it of dried liquid,stop an itch（痒）,or just because it feels good.Boogers（鼻屎）form when dried liquid and cilia,the tiny hairs that line the nostrils（鼻孔）,trap the dust,dirt,and other things.When boogers build up in your nose,it can be uncomfortable,and sometimes just blowing into a tissue doesn't do the trick.

Otolaryngologist Erich P.Voigt,MD,told Business Insider that picking your nose can cause injuries and bleeding within your nostrils.That's not terribly damaging,but when the bacteria from your hands get into your body,it can cause a cold and flu.So doctors strongly suggest not picking the nose.

If dry winter air is causing the dirty liquid to harden in your nostrils,making you want to pick,consider damping the air at home,or taking a steam shower to soften things up in there.

Children,who are most famous for having a finger up their nose,sometimes don't realize how much injury they're causing,and sometimes it.can lead to nose bleeds.

So,next time you go to pick your nose,think about how many bacteria are on your hands and in your boogers, and maybe reach for a tissue instead.Even if you 're alone,and not waiting for the light to turn green,please,use a tissue.

1.Why do people pick their nose?

A. Because they want to disgust others.

B. Because they have the need to do it.

C. Because they have nothing else to do.

D. Because they don't have tissues around.

2.Which of the following can replace the underlined part " do the trick" in Paragraph 1?

A. act    B. work

C. play    D. help

3.Which can help people avoid a cold and flu according to the text?

A. Stopping nose picking.    B. Using tissues regularly.

C. Taking a shower every day.    D. Keeping the air wet at home.

4.What should you do when you have to pick your nose?

A. Be careful not to cause bleeding.

B. Use a tissue instead of bare fingers.

C. Wait for the light to turn red if you are driving.

D. Wash up your hands and clear your fingernails.