问题 选择题

2010年4月5日,朝鲜在位于舞水端里的卫星发射基地成功发射了一枚火箭,顺利将 “光明星2号”试验通信卫星送入轨道。下列关于卫星的说法不正确的是 [ ]

A.卫星在由近地点向远地点运动的过程中,其动能转化为重力势能

B.卫星在由远地点向近地点运动的过程中,其重力势能转化为动能

C.卫星在绕地球运动的过程中,其机械能守恒

D.卫星在绕地球飞行的过程中,其动能和重力势能保持不变

答案

答案:D

阅读理解

阅读理解

     Marriages improve after children grow up and move out, according to an academic study, which

suggests an "empty nest" is not always a bad thing.

     Popular wisdom has it that parents' relationships may suffer once their young fly the coop, because

they feel they have lost their purpose in life.However, a new study by researchers at the University of

California,  Berkeley, has found that many couples actually feel happier when their children leave home

because they are able to enjoy spending time together.

     In total,123 American mothers born in the 1930s were tracked for 18 years and asked to rate their

satisfaction levels shortly after marrying, when they were bringing up babies, once their children reached

their teenage years and finally at age 61, when almost all had "empty nests".

     Although not all said they were happier in general, most claimed their marriages had improved since

their children had left home.Researchers believe this is not just because the spouses were spending more

time together, but because they were able to enjoy each other's company more.

     One of the participants in the study, which is published in the journal Psychological Science, said:"

Once the kids grow up...there's some of that stress removed...that responsibility removed, so things are

a little more relaxed."

     Psychologist Sara Gorchoff, who carried out the investigation, said:"The takehome message for

couples with young children is 'hang in there'. " Her coauthor Oliver John added:"Don't wait until your

kids leave home to schedule quality time with your partner."

      However, Dr Dorothy Rowe, from the British Psychological Society, said the effects of living in an

"empty nest" will depend on the parents' relationship with their children."If you're just waiting for them

to leave home so you can get on with your life, then of course you'll be pleased to see them go, " she

said, "But if you've built your life around your children you'll be terribly lonely.For some parents, their

world falls apart when their children leave."

1. It is commonly believed that________.

A. marriages improve after children leave home

B. an "empty nest" is always a happy thing

C. parents' relationships may suffer once their young grow up and move out

D. parents will be pleased after their children leave home

2. When did many couples feel happier according to the study?

A. At age 61, when almost all had "empty nests".

B. Shortly after marrying.

C. Once their children reached their teenage years.

D. When they were bringing up babies.

3. Marriages improve after children fly the coop not because______.

A. many couples are able to spend time together

B. many couples are able to enjoy each other's company

C. things are a little more relaxed

D. many couples needn't work at all

4. The author of the passage tends to agree that________.

A. parents should build their life around their kids

B. parents should schedule quality time with each other before kids leave home

C. parents' relationship with their kids has no effect on marriages at all

D. parents should be pleased to see their kids leave home

单项选择题