(   )59. What problems can bicycles bring?

A. Bicycles are more and more expensive.

B. Riding bicycles is more dangerous than driving cars.

C. There are no places for so many bicycles.

D. Too many bicy cles may cause traffic jams.

(   )60. What does the last sentence mean?

A. We should drive cars instead of riding bicycles.

B. It’s too far to ride bicycles.

C. Bicycles are safe enough.

D. We still need to do much to solve the problem.

(C)

Water is the "life blood" of our earth. It is in every living thing. It is in the air. It runs through mountains and valleys. It forms lakes and seas. Nature has a great water system(系统).Rainwater finds its way to rivers and lakes. River water runs into the sea. At the mouths of the rivers, fresh water joins the salt water of the sea.

Here at the mouth of a river there is much important plant and animal life. But pollution destroys this life. We have to clean our rivers. Man has to work with nature, not against it.

(    )61.Water is like________.

A. clouds   B. blood   C. life

(    )62. ________ is in every living thing.

A. Blood   B. Water   C. Salt

(    )63. ________The mouth of a river is near _________.

A. the sea   B. a lake  C. a mountain