1.People can teach animals to do some easy work if ______

A. the animals have enough food to eat

B. the animals learn they'll get something to eat

C. the animals are as clever as man

D. the animals are big enough

2.At present people are letting elephants do some________work.

A. difficult

B. heavy

C. light

D.busy

3.We can use dogs to__________

A. drive trains

B. help make cars

C. keep the houses safe

D. carry logs

4.Scientists are trying to let big monkeys_____________________

A. work in factories

B. build houses

C. drive trains

D. drive cars

5.____________can be taught to work for us.

A. Only apes

B. Only dogs

C. Only large elephants

D. Many animals