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【简答题】
Fill in the blanks with the right form of the proper words in the box. Each word should be used only once. take, million, cook, science, south, grow, many, probably, know, nothing People all over the world eat rice. 1. of people in Asia, Africa and South America eat it every day of their lives. Some people eat almost 2. but rice. Rice is a kind of grass. There are 3. than 7,000 kinds of rice. Farmers grow rice in many countries, even in the 4. part of the United States and in eastern Australia. No one really 5. where rice came from. Some 6. think that it started to grow in two places. They think that one kind of rice grew in southern Asia thousands of years ago. Someone in China wrote about it almost 5,000 years ago. Another kind 7. grew in West Africa. Other scientists think that rice came from India, and Indian travelers 8. it to other parts of the world. There are two main ways 9. rice. Most rice grows in west soil. People in many countries do all of the work of growing rice by hand. This is the same way farmers worked hundreds of years ago. In some countries, people now use machines on their rice farms. People use every part of the rice plant. They make animal feed and rice oil from it. They burn dry rice plants for 10. .
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A.
周期不变,占空比增大
B.
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周期不变,占空比减少
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