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问题 选择题

在晴天下午，密闭的玻璃温室中栽培的玉米，即使温度及水分条件适宜，光合速率仍然较低，其主要原因是[ ]

A．O2浓度过低

B．O2浓度过高

C．CO2浓度过低

D．CO2浓度过高

答案

答案：C

解答题

小明家前年收入7200元，去年收入8500元，去年比前年增收百分之几？
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选择题

I was admitted into a famous university. My success______ me pleased with myself but I didn’t .

A．might have made

B．might make

C．should have made

D．should make
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