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问题 单项选择题

男，42岁，低热3个月，头痛、淡漠和嗜睡1周入院。体格检查未发现明显的神经系统异常。实验室检查：抗-HIVgp120（+），抗gp24（+），血清弓形虫抗体可疑，HBsAg（+）。该病人下一步检查应做（）

A.脊液涂片染色镜检

B.脑电图+脑脊液常规

C.颅脑CT检查

D.脑脊液PCR+CT检查

E.HBV-DNA

答案

参考答案：D

解答题
由于生产条件的影响，生产某种产品正品的概率为
7
8
，次品的概率分别为
1
8
．已知生产1件正品获得的利润为6万元，而生产1件次品则亏损2万元．
（1）求生产3件产品恰有2件正品的概率；
（2）设2件产品的利润和（单位：万元）为ξ，求ξ的分布列和数学期望．
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完形填空

语法填空（共10小题；每小题1.5分，满分15分）

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。

The earth is a special planet in the solar system. The explosion of the earth produced carbon, nitrogen, vapor and other gases,    1   (make) the earth’s atmosphere. As the earth cooled    2  , water which is fundamental    3   the development of life appeared and stayed on the surface. The continued    4  (present) of water allowed the earth to dissolve harmful gases into the oceans and this produced a chain reaction which made    5   . possible for life to develop.

Many millions of years later, the arrival of small plants encouraged the development of early shellfish    6   all sorts of fish. Then, with the first green plants appearing on land, land animals appeared and dinosaurs developed and existed on the earth for millions of years. Then Dinosaurs’ sudden disappearance made the rise of mammals possible on the earth. They were different from all life forms    7   ever existed in the past because they produced young from within their bodies. Finally, some small clever animals with hands and legs __8___(appear) and spread all over the earth. Thus they, in    9   turn, have become the most important animals. However, they are putting too much carbon dioxide into the atmosphere. So for millions of years to come,    10   life will continue on the earth will depend on whether the present problem can be solved.

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