单项选择题

A．Why they change color.
B．Whether they change color.
C．How to use them as clocks.
D．Where they can be caught.
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单项选择题
A．Forty minutes.B．Twenty minutes.C．Eighty minutes.D．Seventy minutes.
A．Forty minutes.
B．Twenty minutes.
C．Eighty minutes.
D．Seventy minutes.
单项选择题
A．People have to jump from the top of high rocks.B．It takes people much shorter time to get an immediate pleasure.C．The people, who take part in it, need special training.D．It is very exciting for people to jump at such a high speed.
A．People have to jump from the top of high rocks.
B．It takes people much shorter time to get an immediate pleasure.
C．The people, who take part in it, need special training.
D．It is very exciting for people to jump at such a high speed.
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