Soil that is rich in organic matters _______

A.they are more health conscious

B.they want to taste all kinds of foods

C.natural foods are more delicious than processed foods

D.they want to return to nature

A.Fire can help people in many ways.　　B.Fire can be both helpful and dangerous.

C.Fire can burn things and people.　　D.We must be careful with matches.

A.will die 　　B.will warm our houses

C.might burn us 　　D.won' t help us

A.must be careful　　B.should keep air away from it

C.must know it is dangerous　　D.should cover it with water

A.matches burn paper 　　B.it isn' t interesting

C.they can be dangerous 　　D.they can burn a house

A.Not everybody knows how people began to use fire.

B.Nobody knows how to make a fire.

C.It is an Australian who started a fire.

D.We are not sure how people began to use fire.

A.can say the television is a need in the same sense as food and clothing and shelter

B.can say the television must be in the basic necessities

C.cannot say the television is in the basic necessities

D.can say every family must have one

A.a luxury may change into a need which most people want to get

B.the basic needs are getting smaller and smaller

C.a luxury and the basic needs can be exchanged

D.the basic needs can be changed into a luxury

A.having only reliable income

B.having reliable income and extra income

C.having nothing more than food and clothing

D.having nothing more than reliable income

A.have a reliable income

B.learn how to please his manager

C.finish his work ahead the time

D.get a good education