题目内容：

Now, it is winter and as you have probably noticed, virus (病毒) are everywhere—runny noses, sore throats, nothing quite like the common cold to make you feel so uncomfortable. But experts believe that there is no link between cold weather and catching colds. So why are we particularly easy to catch colds this season?

Internal Medicine expert, Dr Meenakshi Jain of Max Hospital says, “One reason could be because people are likely to stay indoors, so the virus can spread easily. Also the virus grows strong and healthy under wet conditions.”

The common cold can be caused by any of up to 250 kinds of virus. The most common group of them is the kind of virus that hits the nose, which is called rhinovirus （鼻病毒）. Rhinoviruses cause a third and half of all common colds.

“The kind of virus is spread through the nose and respiratory passages(呼吸道), by touch, and by contact with particles(微粒) in the air that are created by sneezing or coughing,” says Dr Jain.

There is no way to treat the common cold. However, there are some tips that can help. Wash your hands regularly, so that germs get killed. Don’t touch your eyes, nose or mouth, which can limit your chances of infection(传染)。 Don’t share drinking glasses with anyone as this will prevent the spread of the virus. Drink lots of water. Make sure to eat enough fruits to boost your immune system(免疫系统). Get enough sleep and you’ll certainly become stronger.

1. A third and half of all common colds are caused by       .

A. the cold weather in the winter

B. the virus that hits people’s nose

C. the condition of the human body

D. the warm temperature in the room

2.The underlined word “boost” in the last paragraph probably means       .

A. improve     B. treat       C. change     D. damage

3.In the last paragraph, the writer mainly wants to tell us        .

A. some ways for the virus to spread

B. the common cold can not be treated

C. some tips on how to keep the cold away

D. exercise is important to people’s health