问题 单项选择题

血液凝块的收缩是由于()

A.纤维蛋白收缩

B.PF3的作用

C.红细胞的叠连

D.血小板收缩蛋白收缩

E.GPIa/Ⅱa复合物

答案

参考答案:D

解析:血小板在纤维蛋白网架结构中心,血小板变形后的伪足可以搭在纤维蛋白上,由于肌动蛋白细丝和肌球蛋白粗丝的相互作用,伪足可向心性收缩,使纤维蛋白束弯曲,在挤出纤维蛋白网隙中血清的同时,也加固了血凝块。

单项选择题
阅读理解

B

Some schools in the United States offer Chinese language classes with government support from China.

Saint Mary’s School is a private college preparatory school in Medford, Oregon.

Carly Irvine is in her fourth year of learning Mandarin(普通话).

CARLY IRVINE: “Since China and America are working so closely and our relationship is growing more and more, I think it will be very important in the future to know Chinese.”

Saint Mary’s also teaches Spanish, German and Latin. It added Mandarin in two thousand five. Two years ago, it became the first school in the country to join the Confucius Classroom program.

The program pays about half the costs of a teacher sent to a school in the United States. China’s Education Ministry also provides books and other materials.

Saint Mary’s principal, Frank Phillips, says knowing Chinese will help students in a world where China is quickly gaining economic power.

Zheng Ling, a teacher at Saint Mary’s, came from China in two thousand eight.

ZHENG LING: “People do not know much about China, especially the latest development. So I think this is a chance for them to know more about China, what China is really like. It’s quite different from what it was twenty years ago.”

The Confucius Classroom program is in about forty countries, including more than fifty American schools and universities.

A recent report said more schools in the United States are teaching Chinese and Arabic, although the numbers are still low.

45. How many American schools and universities have the Confucius Classroom program?

A. 4.                                   B. 20.                          C. 40.                          D. 50.

46. Which of the following is true about Saint Mary’s School?

A. It is a public college preparatory school.

B. It added Mandarin in two thousand six.

C. It became the first school in America to join the Confucius Classroom program.

D. It also teaches Spanish, German and French.

47. How does Carly Irvine think learning Chinese?

A. Helpful.                   B. Useless.                    C. Unnecessary.             D. Terrible.

48. What’s the passage mainly about?

A. Some US Students Learn Mandarin with China’s Help.

B. China is quickly gaining economic power.

C. Saint Mary’s School.                                 

D. Carly Irvine.