【简答题】完形填空。 Many of you are studying English and you may be (1)_______ why it is so difficult to learn. It's actually not too difficult to learn (2)______ you know some (3)_______ about the language and cul...
【单选题】Many people feel that human beings are responsible for the disappearance of some other animal species. While we may have hastened the disappearance of some, abundant evidence suggests mankind has had ...
A.
Human beings have hastened the disappearance of some.
B.
There was mass extinction long before humanity's time on Earth.
C.
Human beings'activities have had great impact on the earth.
D.
Many species have extinct since the human race came into being.