问题 单项选择题 A1/A2型题

孕早期与胎儿致畸无关的因素是()。

A.吸烟及饮酒

B.喷洒农药

C.补充乳酸钙

D.口服甲硝唑

E.患病毒感染性疾病

答案

参考答案:C

解析:孕早期对外界的不良刺激最为敏感,是胎儿畸形的高发期。此期孕妇应避免致畸的因素,包括:①体温升高,常由细菌性感染引起,以及高温作业、热盆浴等;②烟酒;③妊娠早期要克服妊娠反应影响,少吃多餐,尽量保证平衡膳食,忌偏食;④药物;⑤对胎儿有毒、有害的物质,如放射线、农药、铅、汞、镉等。而补充乳酸钙与致畸无关。避错:本题部分考生易选D,认为甲硝唑对胎儿没有影响,这是不对的。长期大剂量应用甲硝唑有致癌和致突变作用,妊娠早期禁用。而乳酸钙为孕期所需,因为胎儿的生长发育需要一定的钙质,适当补充乳酸钙有利于胎儿生长。因此,本题选C。其他几项均可致畸。

阅读理解

The Home of My People

When Lewis and Clark stepped onto the Weippe Prairie in present-day Idaho in September 1805, they met the Nez Perce Indians. In the following years, the white explorers(探险者)began to fight with the Indians for their land. Some Nez Perce chiefs signed agreements with the U.S. government, selling part of their lands. But the government always broke those agreements and demanded more land.

Other chiefs refused to go along with the government’s plans. The most famous was Chief Joseph, whose people lived in the Wallowa Valley(present-day Oregon).

“In order to have all people understand how much land we owned,” he once explained, “my father planted poles around it and said: ‘Inside is the home of my people…It circled around the graves(坟墓)of our fathers, and we will never give up these graves to any man.’”

But in 1874, the U.S. government declared the valley open for white settlement and ordered the Nez Perce onto a reservation(保留地). Seeing that resistance was useless, Chief Joseph agreed to move.

Later fighting broke out between the Nez Perce and U.S. soldiers. Chief Joseph tried to lead his people to Canada, winning several battles against the soldiers during their flight. But finally, he was forced to give in.

56. Which historic site (on the map)lies in the south of today’s Nez Perce Reservation?

A. Buffalo Eddy.             B. Dug Bar.

C. Joseph Canyon Viewpoint.         D. Chief Looking Glass Camp.

57. What can we learn about the Nez Perce lands from the map?

A. They were in the state of Oregon.

B. They have become a historic site.

C. They have become much smaller.

D. They were limited to the Wallowa Valley.

58. From Paragraph 3, we know that the Indians wanted to ______.

A. show off their land      B. keep their land

C. turn their place into a graveyard      D. build their homes around the poles

单项选择题