问题 选择题
如图所示,在x轴上方存在着垂直于纸面向里、磁感应强度为B的匀强磁场,一个不计重力的带电粒子从坐标原点O处以速度v进入磁场,粒子进人磁场时的速度方向垂直于磁场且与x轴正方向成120°角,若粒子穿过y轴正半轴后在磁场中到x轴的最大距离为a,则该粒子的比荷和所带电荷的正负是(  )

A.,正电荷

B.,正电荷

C.,负电荷

D.,负电荷

答案

答案:C

单项选择题
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A cancer-stricken British teenage girl said Thursday she had been moved by messages of support from around the world after writing an online "Bucket List" of things she wanted to do before dying.

Alice Pyne, l5, created an Internet blog in which she described her fight against a cancer of the white blood cells. “I’ve been fighting cancer for almost four years and now l know that the cancer is gaining on me and it doesn't look like I'm going to win this one," she wrote.

For her list, the teenager took inspiration from the 2007 film “The Bucket List”, in which two terminally ill(患绝症的) men, played by Morgan Freeman and Jack Nicholson, draw up a list of things they wish to do before they die.

On her list, at the site www.alicepyne.blogspot.com, she has included making everyone sign up to be a bone marrow donor(骨髓捐赠者), swimming with sharks, meeting boy band Take That and getting a purple iPad computer.

Messages of support and offers of help quickly flooded her webpage and it became one of the most talked about subjects on Twitter.

"Oh dear and I thought that I was just doing a little blog for a few friends!" she wrote after her site attracted huge attention. "Thank you so much for all your lovely messages to me."    

Pyne, who lives with her family in the northwest English town of Ulverston, revealed (透露) the management of Take That had arranged for her to see the band after reading her blog. A group of local lawmakers have also joined forces with the Anthony Nolan blood cancer charity to encourage people to join its stem cell register.

小题1:What happened after Alice Pyne wrote her "Bucket List"?

A.The media called on people to help her.

B.People sent gifts to her from all over the world.

C.A lot of people offered to donate bone marrow to her.

D.People around the world sent messages to support her.小题2: Alice Pyne wrote her "Bucket List" to  ___________.

A.express her last few wishes

B.say goodbye to a few friends

C.give comfort to two terminally ill men

D.catch people's attention小题3:It can be inferred from the second paragraph that Alice Pyne _________.

A.is unaware of her own conditions

B.is calm to know that death is approaching

C.is very sad to know that she will die

D.is still quite confident in fighting against cancer小题4:Which of the following is NOT on Alice Pyne's "Bucket List"?

A.To meet a boy.

B.To get a cool computer.

C.To swim with sharks.

D.To ask people to donate bone marrow.