单项选择题

What made scientists think animal can be made to work for us one day()

A. Animals are very skillful at a circus.
B. They are big and strong.
C. Some animals are as clever as human beings.
D. Animals can be trained because they like to get something as a reward.

<上一题目录下一题>

热门试题

单项选择题

Why is it dangerous to burn too much wood()

A. The fire could burn you.
B. It’s not healthy to be too warm.
C. Harmful chemicals are released in the soot.
D. The smoke is filled with unseeable tiny pieces.

单项选择题

According to the passage which of the following facts is NOT true()

A. Many animals have poor eyesight while their sense of smell, is quite good.
B. Dogs are color blind.
C. The human sense of smell is not good.
D. Dogs can see no more than shades of gray.