43. Teachers encourage the use of dictionaries so that____.

A. students will be able to express their ideas more freely.

B. teachers will have less trouble in correcting mistakes.

C. students will have more trust in writing.

D. students will learn to spell words correctly.

44. The writer seems to think that the teacher’s judgment on that sensitive piece of writing is____.

A. reasonable B. unfair C. foolish D. careless

45. The main idea of the passage is _______.

A. the importance of developing writing skills

B. the importance of spelling

C. the correct way of marking composition

D. the relationship between spelling and the content of a composition

C

NOT all memories are sweet.Some people spend all their lives trying to forget bad experiences.Violence and traffic accidents can leave people with terrible physical and emotional scars.Often the experiences in nightmares appear repeatedly.

Now American researchers think they are close to developing a pill, which will help people forget bad memories.The pill is designed to be taken immediately after a frightening experience.They hope it might reduce, or possibly wipe out, the effect of painful memories.

In November, experts tested a drug on people in the US and France.The drug stops the body releasing chemicals that fix memories in the brain. So far, the research has suggested that only the emotional effects of memories may be reduced, not that the memories are wiped out.They are not sure to what degree people's memories are affected.

The research has caused a lot of argument.Some think it is a bad idea, while others support it.Supporters say it could lead to pills that prevent or treat soldiers' troubling memories after war.They say that there are many people who suffer from terrible memories.

“Some memories can ruin people's lives.They come back to you when you don't want to have them in a daydream or nightmare.They usually come with very painful emotions,” said Roger Pitman, a professor of psychiatry at Harvard Medical School.“This could relieve a lot of that suffering.”

But those who are against the research say that maybe the pills can change people's memories and changing memories is very dangerous because memories give us our identity.They also help us all avoid the mistakes of the past.

“All of us can think of bad events in our lives that were terrible at the time but make us who we are.I'm not sure we want to wipe those memories out.” said Rebecca Dresser, a medical ethicist(伦理学家).

46.The passage is mainly about .

A.a new medical invention

B.a new research on the pill

C.an argument about the research on the pill

D.a way of wiping out painful memories

47.The drug tested on people can .

A.cause the brain to fix memories

B.stop people remembering bad experiences

C.wipe out the emotional effects of memories

D.prevent body producing certain chemicals

48.We can infer from the passage that .

A.Experts are not sure about the effects of the pills.

B.the pill will certainly stop people's emotional memories

C.taking the pill will do harm to people's physical health

D.the pill has already been produced and used by the public America