单项选择题

A．They both attract scientists’ attention.
B．They can both be quite challenging.
C．They are both thought-provoking.
D．They may lead to surprising findings.
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单项选择题
A．It’s worse than 30 years ago.B．It remains almost the same as before.C．There are more extremes in the weather.D．There has been a significant rise in temperature.
A．It’s worse than 30 years ago.
B．It remains almost the same as before.
C．There are more extremes in the weather.
D．There has been a significant rise in temperature.
单项选择题
A．It is more exciting than space travel.B．It is much cheaper than space travel.C．It is much safer than space travel.D．It is less time-consuming than space travel.
A．It is more exciting than space travel.
B．It is much cheaper than space travel.
C．It is much safer than space travel.
D．It is less time-consuming than space travel.
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