52.There were such many beautiful bikes that it was hard to choose.

51.I have heard him from my brother,but I don’t know much about him.

50.What did people use to keeping records in the past?

49.Oprah Winfrey is a black woman whose rise to fame is a inspiring story.

48.A book that was printed in the year of 868 has been found.

47.I still remember the day when we spent together.

46.He asked that we were going to the cinema tonight.

45.The writer gives us the idea that ______ .

A.acid rain can be stopped in the future

B.it’s too late to stop acid rain now

C.acid rain can’t be stopped for ever

D.in the year 2010,birds will sing their happy songs only in spring

单句改错

44.You may know that“the same problems” in the third paragraph(段落)come from ______.

A.Europe　　　　　　　　　　　　　　　　　　　　　　　　　　　ada

C.acid rain　　　　　　　　　　　　　　　　　　　　　　 D.all over the world

43.Which of the following is true?

A.Cars can go up into the sky now.

B.Fish eggs are afraid of acid.

C.There are no fish in lakes now.

D.A little acid in the water is proper.