单项选择题
- A．Why species don’t avoid extinction by adapting.
B．Why species become extinct at the rate they do.
C．Why humans aren’t extinct.
D．How many species aren’t extinct.
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填空题
36（） -
单项选择题
A．He enjoyed using it.
B．He left it in the taxi.
C．He left it at the airport.
D．He lost it on his trip. -
单项选择题
A．There was much more disorder.
B．This time the electricity supply failed.
C．It was quite unexpected.
D．It came in the cool autumn.
