胎龄＞28周至＜37周的新生儿 A．足月儿 B．早产儿 C．过期产儿

At first sight the planet Mars(火星)does not appear very welcoming to any kind of life. It has very little oxygen and water, the temperature at night is below 50 degrees and winds of 100 miles(161 kilometers)per hour cause severe dust storms. However, the surface of the planet seems to show that water flowed across it at some time in the past, and it is believed that there would be enough ice at the poles to cover the planet with water if it melted. Although there is no life on the Mars now, some scientists think there may have been some form of life a long time ago. At that time, the planet had active volcanoes(火山); the atmosphere was thicker and warmer; and there was water. In fact, in some ways the Mars may have been similar to the Earth, where life exists.

Some people believe that the Mars could support life in the future if the right conditions were produced. The first step would be to warm the planet using certain gases which trap the Sun’s heat in the planet’s atmosphere. With warmth, water and carbon dioxide, simple plants could begin to grow. These plants could slowly make the Mars fit to live on. It is judged that the whole process might take between

100, 000 and 200, 000 years. In the meantime, people could begin to live on the planet in a special closed environment. They would provide a lot of useful information about conditions on the Mars and the problems connected with living there.

小题1: According to the passage, the planet Mars has no　　　on it.

A．winds

B．dust

C．mountains

D．animals小题2:It is believed that on the Mars now　　　.

A．there is a large amount of ice at the poles

B．there is a thicker and warmer atmosphere

C．there are some kinds of simple plants

D．there are many active volcanoes小题3: What is the topic of Paragraph 2?

A．Certain gases should be used to warm the Mars.

B．Plants should be grown to make the Mars fit to live on.

C．The Mars could support life on right conditions in the future.

D．People could live on the Mars in a special closed environment.小题4: The most suitable title for the passage is　　　.

A．No Life on the Mars

B．Study of the Mars

C．The Possibility of Life on the Mars

D．Future Conditions on the Mars

俗称“马牙子”的上皮珠是

A．剩余牙板上皮

B．剩余牙龈上皮

C．缩余釉上皮

D．剩余唾液腺导管上皮

E．口腔黏膜上皮

T加工中心为全市60家超市配送饮料，T加工中心承诺商品完好率为98%。如果物流商品总量为4000千克，则T加工中心的缺损商品量不应超过( )千克。

A．20

B．40

C．60

D．80

信息的查找过程主要有四个步骤，请选择正确的排序方式。（）①根据检索表达式的逻辑关系确定查寻方法和途径。②对查寻提问进行概念分析并用检索系统确定词表中的词加以表达。③按顺序在检索系统中查询同检索词相一致的检索标识。④用户要明确自己的信息需求，形成查询提问。

A.④①②③

B.③④①②

C.④①③②

D.④②①③

下列属于EPON技术优势的有（）。

A.宽带容量大

B.传输距离长

C.无源成本低

D.信号受干扰小