Nuclear science should be developed to benefit the people ______ harm them.

A. more than　　 B. rather than　　 C. less than　　 D. better than

閱讀下面短文，根據(jù)所讀內(nèi)容在表格中的空白處填入恰當?shù)膯卧~。注意：每個空格只填一個單詞。

　 Attention deficit（不足）hyperactivity（活動過度）disorder is known by the letters A．D．H D．Children with A．D．H．D．might have trouble paying attention．They might not seem to listen and might forget things．They might not be able to stay seated or play quietly．They might talk too much and act and speak without thinking about the results of their behavior．These are among the signs named on the web site of America’s Centers for Disease Control and Prevention．

Doctors usually identify the disorder in children．But experts say the behaviors often last into adulthood．Researchers have been looking for the cause or causes of attention deficit hyperactivity disorder．Now, a brain-imaging study offers more evidence that could lead to new ways to treat it．Researchers say they observed shortages in the brain's reward system in patients with A．D．H．D．The study found that levels of some proteins were lower than normal．Nora Volkow, director of the National Institute on Drug Abuse, says the lack of attention and self –control that mark A.B.H.D. could be caused by problem in the flow of dopamine（多巴胺）. She says people might have difficulty completing an activity if they cannot expect some kind of reward in return. Researchers studied the pathways on which dopamine travels and A.D.H.D. Doctor Volkow says the researchers then compared the pathways to those of 44 adults without the disorder. “There was a lower concentration of dopamine markers in the brain of individuals with A.D.H.D., specifically in the areas of the brain that are involved with reward and motivation. And the dopamine levels were directly linked to the severity, of the patient’s inattention she says.”

The study used brain images taken at Brookhaven National Laboratory in new York State. Gene-Jack Wang is chairman of the Brookdhaven medical department. He says the finding might also help explain why people with A.D.H.D.

are more likely to abuse drugs or overeat. He says they might be attempting to increase their dopamine levels to make up for the deficits in their reward system.

_______I came to the music hall ,it was a new and grand one .

A .For the first time　　 B .The first time　 C. Firstly　　 D. First time

It was already 11 o’clock in the evening 　　　they arrived at the hotel.

A. when B. before C. that D. since

—Do you have any idea what Paul does all day?

—As I know, he spends at least as much time playing as he _______.

A. writes　　　　 B. does writing 　　　　　 C. is writing　　 　　 D. does write

I worked in our garden; _________Tom and Jim were tying a big sign onto one of the trees.

A. which　　 B.when　　 C.where　　 D.that

—Did you visit the famous cultural relics last month?

—No, we ________ it, but we spent too much time shopping.

A. could have visited　　　 　　　　　　　 B. must have visited

C. can’t have visited　　　　 　　　　　　　　 D. shouldn’t have visited

His health failing, ____ last year.

A. so the school gave Mr. Smith leave　

B. the school had given Mr. Smith leave

C. so Mr. Smith went on leave from work 　

D. Mr. Smith went on leave from work

________with so much trouble, we failed to complete the task on time.

A．Faced　　　　　　　　　B．Face

C．Facing 　　　　 　　　D．To face

1.    I______ my high school made of bamboo and grass.

A. asked about B. was asked about C. asked for D. was asked for