第29题: [单项选择]The microscope can ______ the object 100 times. A. magnify B. increase C. develop D. multiply 参考答案:A 答案解析:magnify扩大;increase增长,增加;develop发展,壮大,增大;multiply(数量)增多,增加。句意:显微镜能把物体直径放大100倍。
第31题: [单项选择]Why does Jack do yard work A. To earn money for school. B. To keep his family’’s yard looking nice. C. To be able to work outdoors. D. To get exercise while working. 参考答案:A