Ⅰ.单词拼写
1．Bikes are very popular in China. Many people prefer ________ (骑自行车) to work.
答案：cycling
2．Scientists have been trying to find ways to ________ (预报) earthquakes.
答案：forecast
3．The increase in the number of plants can stop the process of ________ (沙漠化)．
答案：desertification
4．The children carved a pumpkin into a ________ (吓人的) mask.
答案：frightening
