阅读下面短文，根据文章内容，将文中划线句子(1—2小题)翻译成汉语，并回答3～5小题所提问题。
(1)In northern China during spring, big sandstorms often make trouble for people. Sandstorms usually happen in spring. They have happened in more than 10 provinces in northern China this year. People in southern China don't have to worry about this kind of bad weather. Most of the sand comes from the north of China. In northern China, (2) lots of places have few trees and don't get much rain. People there have been cutting down too many trees. When there aren't many trees, the ground can't keep enough water. Over the years, the ground dries up and turns to sand. When spring comes and the ice melts (融化), the ground becomes loose (松散). Strong winds take the loose sand into the sky.
Sandstorms are bad for people's health. If people breathe too much sand, they could cough or have asthma (哮喘). Sandstorms also give farmers lots of problems. Sometimes their sheep get lost in the storms and never get back home. The winds also tear farmers' houses down. What can you do to stop sandstorms? Here is an idea. Ask your parents to help you plant some trees this spring. If you see people cutting down too many trees, tell them about the danger of sandstorms, and ask your government to stop them.
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3. Where does most of the sand come from?
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4. What kind of problems do sandstorms give farmers?
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5. What's your idea to help stop sandstorms?
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