题目内容
15．---Shall we plant more trees in spring？---Good idea!We should make a contribution to the environment．（ ）
| A． | protect | B． | protecting | C． | protects | D． | be protected |
分析 -春天我们要种更多的树吗？-好主意！我们应该为保护环境做贡献．
解答 正确答案：B．根据题干可知春天我们应该种更多的树，为保护环境做贡献，其中make a contribution to doing sth．表示为某事做贡献，故选择B．
点评 本题考查动名词，基础题，熟悉常用的动词（短语）后可跟动名词的固定结构及其含义，再根据题干即可作出选择．
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4．
A：What are you doing，Jenny？
B：（56）C
A：An experiment？What is it about？
B：A theory about air pressure（大气压）．I fill a jar with water．I cover the top with a piece of cardboard．Then，I turn the jar upside down．（57）A
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B：（59）E
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B：（56）C
A：An experiment？What is it about？
B：A theory about air pressure（大气压）．I fill a jar with water．I cover the top with a piece of cardboard．Then，I turn the jar upside down．（57）A
A：I don't think we can do it inside．I'm sure that the floor will get wet．
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A：Why？The water won't stay in the jar．
B：（59）E
A：Great．（60）D．