单项选择题

______ worked harder, he would have passed the exam.

A．He had
B．When he
C．If he
D．Had he
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单项选择题
Reading is learning, but applying is also learning and the more important kind of learning at that.
A．看书是学习，但是应用也是学习，同时更重要的学习种类是那样。
B．读书是学习，使用也是学习，而且是更重要的学习。
C．阅读是学习，但是实施也是学习，更重要的学习种类在那点上。
D．读书是学习，但使用也是学习，并且是更重要种类的学习。
单项选择题
What is the passage mainly talking about
A．The usefulness of solar energy.
B．Solar energy and its transformation into heat.
C．How can solar energy be stored.
D．How can solar energy be made to serve man.
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