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.
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.
填空题exerting