单项选择题

Why did Isaksen advise people not to have foreign pets?
A. They attack human beings.
B. We need to study native animals.
C. They can’t live out of the rain forest.
D. We do not know much about them yet.

A.
B.
B.
C.
C.
D.
D.
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多项选择题
红黏土的物理工程特性有（）。

A．天然含水量大
B．塑性指数低
C．强度较高
D．较低的压缩性
E．不具有湿陷性
单项选择题
The text suggests that in the future we _______.A. may have to fight against more new diseasesB. may easily get infected by diseases from dogsC. should not be allowed to have petsD. should stop buying pets from Africa
A.
A.
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