My sister，an inexperienced rider，was found sitting on the bicycle _________ to balance it．

　　A．having tried　　　　　　　B．trying

　　C．to try　　　　　　　　　　D．tried

Leaves are found on all kinds of trees, but they differ greatly_________ size and shape.

A. on    B. from    C. by    D. in

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。 

增加：在缺词处加一个漏子符号（/\），并在其下面写出该加的词。 

删除：把多余的词用斜线（\）划掉。 

修改：在错的词下划一横线，并在该词下面写出修改后的词。 

注意：1. 每处错误仅限1词； 

2. 只允许修改10处，多者（从第11处起）不计分。 

When I was in high school, most of my friend had bicycles. I hoped I could also have it. One   

day I saw a second-hand bicycle, that was only one hundred yuan. I asked my father /\ the money.   But he said he could only give me half of the money. He should find the other half myself. So I went to sell newspapers after the school. My father was pleased if I showed him the money a month  after. He gives me the other fifty. You can imagine how much happy I was when I rode to school on later gave my own bicycle.

The fellow was said to be _____ of a scholar.  As _____ turned out, he was a cheat.

　  A. something; he               B. much; he  

  　C. something; it               D. nothing; it

As we all know, several primary schools and factories were named _____ the hero.

   A. from          B. at         C. after       D. to

Nobody noticed the thief slip into the house because the lights happened to__________.

put up            B. give in     C. be turned on     D. go out

    A new study has found no evidence that sunscreen, commonly used to reduce the risk of skin cancer, actually increase the risk.

    Researchers from the University of Iowa based their findings on a review of 18 earlier studies that looked at the association between sunscreen use and melanoma (黑素瘤). They said that they found flaws in studies that had reported associations between sunscreen use and higher risk of melanoma

 Most health experts believe that by protecting the skin from the harmful effects of the sun, sunscreen helps prevent skin cancer, which is increasing in incidence (发生率) faster than any other cancer in the United States.

    But questions has been raised about sunscreen and whether it may has opposite effect, perhaps by allowing people to remain exposed to the sun longer without burning.

    The researchers said that among the problems with some earlier studies is that they often failed to take into account that those people most at risk for skin cancer--- people with fair skin and freckles (雀斑), for example--- are more likely to use sunscreen. As a result, it may appear that sunscreen users get cancer more often.

    The studies, which generally relied on volunteers to recall their sunscreen use, were also unable to prove how well the products had been applied, said the new study.

The underlined word “flaws” in the 2nd paragraph most probably means ______.

A. evidence        B. facts          C. faults              D. failures

People with fair skin and freckles          .

A. seldom use sunscreen              B. are more in danger of skin cancer

C. can be free from the harm of the sun   D. often expose themselves to the sun

We can learn from the passage that ______.

A. sunscreen users get skin cancer more often

B. the volunteers have proved the effect of sunscreen

C. the new study was based on the experiences of volunteers

D. the number of skin cancer patients is increasing in America

Which of the following can be the title for this passage?

A. Sunscreen to Prevent Skin Cancer           B. Sunscreen to Increase Skin Cancer

C. Skin Cancer Caused by Sunscreen           D. Skin Cancer Caused by Freckles

The final score of the basketball match was 93-94. We were only ________ beaten.

A. nearly                 B. slightly             C. narrowly                D. lightly

Usually John would be late for meetings. But this time, ____ to my surprise, he arrived on time.

A little                       B. much                   C. ever                     D. even

—I wonder how much you charge for your services.

— The first two are free____ the third costs $30.

A. while                  B. until      C. when                  D. before