问题 选择题

如图所示,在两等量同种点电荷的电场中,MN为两电荷连线的中垂线,B是直线AC与MN的交点,且A与C关于MN对称,D点是两电荷连线上的一点.下列判断正确的是(  )

A.B点场强一定大于D点场强

B.B、D两点的场强可能相同

C.试探电荷+q在A、C两点受到的电场力大小可能不相等

D.试探电荷+q在A、C两点受到的电场力大小相等

答案

解;

A、在两等量同种电荷连线上,中点的电场强度最小;在两等量同种电荷连线的中垂线上,中点的电场强度最小;由于B、D两点处电场线的疏密不能确定,所以不能判断出B点场强与D点场强的大小关系.故A错误.

B、B点的场强方向向上,D点场强方向向右,所以两点的场强不可能相同,故B错误;

C、D、因两等量同种电荷的电场具有对称性,所以A、C两点的场强大小相等,试探电荷+q在A、C两点受到的电场力大小相等,故C错误,D正确.

故选:D.

单项选择题
阅读理解

阅读理解。

     Cancer researchers urged people on Wednesday to take more vitamin D to lower risk of cancer,

saying studies showed a clear link. "Our suggestion is for people to increase their intake (吸入,摄入),

through diet or a vitamin supplement," Dr. Cedric Garland said in a telephone interview.

     Garland's research team reviewed 63 studies, including several large long-term ones, on the

relationship between vitamin D and certain types of cancer worldwide between 1966 and 2004. "There's

nothing that has this ability to prevent cancer," he said, urging governments and public health officials to

do more to fortify (增强) foods with vitamin D. Garland is member of a team at San Diego Moores

Cancer Hospital that published its findings this week online in the American Journal of Public Health.

Vitamin D is found in milk, as well as in some fortified orange juice, yogurt and cheeses, usually at

around 100 international units(IU)a serving.  "People might want to consider a vitamin supplement to

raise their intake to 1000 units per day" Garland said, adding that it was well within the safety guidelines

established by the National Academy of Sciences.

     The authors said that taking more vitamin D could be especially important for people living in northern

areas, which receive less vitamin D from sunshine.

     "African Americans, who don't produce as much of the vitamin because of their skin color, could also

benefit significantly from a higher intake," the authors said.

1. According to the passage, people are advised to take more Vitamin D, because ________.

A. it is nutritious                  

B. it can't harm people's health

C. it can lower cancer risk          

D. it is not taken enough every day

2. Garland is probably ________.

A. a health researcher                

B. a doctor    

C. a medicine scientist                

D. a public health official

3. Which of the following foods can lower people's chance of getting cancer?

A. Milk.                            

B. Fortified orange juice.  

C. Fortified yogurt.                  

D. All of the above.

4. ________ should take more Vitamin D according to the passage.

A. Asian people

B. African people  

C. American people

D. Oceanian people