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
Lynn Eldridge thinks there may be some truth in what Stewart says because ______.
A．organs containing plant extracts remain healthy indefinitely
B．dead bodies can be kept alive with transplanted organs
C．organs treated with certain plant juices revive dead bodies
D．extracts from certain plants help keep organs alive
单项选择题
How many of new Silent Riders were in regular service at the moment
A．None.
B．Twenty.
C．Fifty.
D．One.
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