单项选择题

He is ______ about his chances of winning a gold medal in the Olympics next year.

A．optimistic
B．optional
C．outstanding
D．obvious
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单项选择题
John Dewey believed that education should be a preparation for life, that a person learns by doing, and that teaching must ______ the curiosity and creativity of children.
A．seek
B．stimulate
C．shape
D．secure
单项选择题
The last half of the nineteenth century ______ the steady improvement in the means of travel.
A．have witnessed
B．was witnessed
C．witnessed
D．is witnessed
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