单项选择题

Stewart found certain plant juices were useful in his experiments when he ______.

A．realized they gave off gas fumes
B．saw they contained electricity
C．noticed their effect on ms skin
D．discovered their secret names
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单项选择题
Why will battery buses cost less than conventional buses in the long run
A．They will spread the capital cost over a long period.
B．They will be stronger and last longer.
C．They will use less fuel and cost less to maintain.
D．They will be charged at night when electricity costs less.
单项选择题
The Mark Ⅱ will have a number of advantages over the prototype. Which of these is NOT one of them
A．It will carry more passengers.
B．It will have a wider range.
C．It can be used all through the way.
D．It will cost less to recharge.
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