填空题

How much of the electrical supply ______ (来源于水力发电)

【参考答案】

is derived from water power

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单项选择题

Little Hercules is the first remotely controlled vehicle（）

A. that can be used for deep-sea expedition
B. that is used to explore the "Coral Triangle"
C. that can go as deeply as 2.3 miles undersea
D. that is developed by American scientists

填空题

Only after he had failed his oral test ______ (他才逐渐意识到联系的必要性).