单项选择题

She exhibited great powers of endurance during the climb.

A．play
B．send
C．show
D．tell

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单项选择题

In the last paragraph, what does the word switch stand for（）

A．Coal-burning to replace the oil and gas.
B．Fossil fuels to replace the oil and gas.
C．Green fuels to replace the oil and gas.
D．The oil and gas to replace the, coal-burning.

单项选择题

The word considered in paragraph 5 could be best replaced by（）。

A．"thought".
B．"rated".
C．"regarded".
D．"believed".