氨基酸的排列顺序是决定蛋白质多样性的原因之一,其肽链由7种不同的氨基酸构成,若只

题型:填空题

问题:

氨基酸的排列顺序是决定蛋白质多样性的原因之一,其肽链由7种不同的氨基酸构成,若只改变其中的三种氨基酸的位置,其余四种不变,则不同的改变方法有______.

考点:排列与组合
题型:填空题

阅读下面一首元曲,然后回答问题。(7分)

山坡羊•述怀

薛昂夫

大江东去,长安西去,为功名走遍天涯路。

厌舟车,喜琴书,早星星鬓影瓜田暮。心待足时名便足。高,高处苦;低,低处苦。

【注】瓜田:邵平秦时封东陵侯,汉初种瓜于长安东门。

(1)简要描绘出“厌舟车,喜琴书,早星星鬓影瓜田暮”的人物形象。(3分)

(2)有曲评家认为末了“高,高处苦;低,低处苦“句有警戒意,请说说你的理解。(4分)

题型:填空题

子公司的人力资源经理由东道国员工担任,各子公司实行适合当地特定环境的人力资源管理政策的国际人力资源管理模式是()。

A.民族中心模式

B.多中心模式

C.地区中心模式

D.公司中心模式

题型:填空题

小儿白细胞分类中,粒细胞与淋巴细胞百分数曲线的两个交叉发生于

A.4~6天,4~6岁

B.7天,1岁

C.4~6周,4~6岁

D.4~6天,4~6周

E.1岁,6岁

题型:填空题

患儿男,6岁,主诉发热、咳嗽半个月,乏力、呼吸困难5天。查体:T38℃。呼吸急促,双肺闻及中细湿啰音。心前区饱满,心尖搏动弥散,心浊音界稍扩大,心音低钝遥远。腹胀,肝肋下5cm,质软缘钝。颈静脉回流征(+),移动性浊音(+),双下肢水肿。

若已有检查仍不能证明心包积液,尚需考虑的诊断是()

A.病毒性心肌炎

B.重症肺炎

C.限制性心肌病

D.肝硬化

E.先天性心脏病

题型:填空题

阅读理解。

     The coast of the State of Maine is one of the most irregular in the world. A straight line running from

the southernmost coastal city to the northernmost coastal city would measure about 225 miles. If you

followed the coastline between these points, you would travel more than ten times as far. This irregularity

is the result of what is called a drowned coastline. The term comes from the glacial (冰川的)activity of

the Ice Age. At that time, the whole area that is now Maine was part of a mountain range that towered

above the sea. As the glacier descended, however, it applied enormous force on those mountains, and

they sank into the sea.

     As the mountains sank, ocean water charged over the lowest parts of the remaining land. And the

highest parts of the former mountain range, nearest the shore, remained as islands. Marine fossils found

here are 225 feet above sea level indicating the level of the shoreline prior to the glacier.

     The 2,500-mile-long rocky and jagged coastline of Maine keeps watch over nearly 2,000 islands.

Many of these islands are tiny and uninhabited, but many are home to blooming communities. Mt. Desert

Island is one of the largest, most beautiful of the Maine coast islands left behind by the glacier. Measuring

16 miles by 12 miles, Mt. Desert was very nearly formed as two distinct islands. It is split almost in half

by Somes Sound, a very deep and very narrow stretch of water seven miles long.

     For years, Mt. Desert Island, particularly its major settlement, Bar Harbor, has afforded summer

homes for the wealthy. Recently, though, Bar Harbor has become a new arts community as well. But the

best part of the island is the unspoiled forest land known as Acadia National Park. Since the island sits

on the border between two different geographical zones, the park supports the plants and animals of both

zones. It also lies in a major bird migration lane and is a resting spot for many birds.

     The establishment of Acadia National park in 1916 means that this natural monument will be

preserved and that it will be available to all people, not just the wealthy. Visitors to Acadia may receive

nature instruction from the park naturalists as well as enjoy camping, hiking, cycling, and boating. Or

they may choose to spend time at the museum learning about the Stone Age inhabitants of the island.

1. The large number of small islands along the coast of Maine is the result of _______.

A. the drowning of the Maine coastline

B. glacier's forcing mountains into the sea

C. the irregularity of the Maine coastline

D. ocean water's flooding the mountain range

2. From the passage, we learn that _______. 

A. the coastline of Maine is ten times longer after the Ice Age

B. there are more than 2500 islands along the Maine coastline  

C. Mt. Desert Island has been broken apart by a 7-mile-long water stretch

D. an arts community gave way to the summer homes on Mt. Desert Island      

3. What CANNOT be inferred about the Acadia Nation Park?

A. It welcomes all the people, rich or poor.

B. It has much appeal for bird-watching lovers.

C. It offers visitors both entertainment and education.

D. It is a border between the two geographical zones.

4. Which of the following might be the best title of the passage?

A. The past and the present of Maine

B. The formation of Maine coastline

C. Efforts for preserving national parks

D. Tourist attractions on Mt. Desert Island

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