单项选择题

The ship's generator broke down, and the pumps had to be operated ______ instead of mechanically.

[A] manually
[B] artificially
[C] automatically
[D] synthetically

<上一题目录下一题>

热门试题

单项选择题Our hopes ______ and fell in the same instant.

[A] arose
[B] raised
[C] rose
[D] aroused

单项选择题______ much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption.

[A] Because
[B] For
[C] Since
[D] While