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问题 选择题
已知
a
=(1，2)， 2
a
-
b
=(3，1)，则
a
•
b
=（　　）
A．2B．3C．4D．5
答案

设

b
=（x，y），则2
a
-
b
=（2-x，4-y）=（3，1），

故可得

2-x=3
4-y=1
，解得
x=-1
y=3
，即
b
=（-1，3），

故

a
•
b
=1×（-1）+2×3=5

故选D

单项选择题 案例分析题

患者，女，42岁，右上腹绞痛3小时入院。查体：皮肤、巩膜未见黄染。辅助检查：血清总胆红素26μmol/L，超声示胆总管结石。

关于黄疸的诊断，该患者符合哪项（）

A.无黄疸

B.隐性黄疸

C.轻度黄疸

D.中度黄疸

E.重度黄疸
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填空题

World Water Shortage


A new study warns that about thirty percent of the world’s people may not have enough water by the year 2025.
A private American organization called (1) Action International did the new study. It says (2) than three-hundred-thirty-five-million people (3) enough water now. The people live in twenty-eight (4) . Most of the countries are in Africa or the (5) East.
P-A-I researcher Robert Engelman says (6) the year 2025, about three-thousand-million people (7) lack water. At least 18 more countries are (8) to have severe water problems. The demand (9) water keeps increasing. Yet the amount of water on Earth (10) the same.
Mr. Engelman says the population in countries that lack water is (11) faster than in other parts of the world. He says (12) growth in these countries will continue to (13) .
The report says lack of water in the future may (14) in several problems. It may increase health (15) . Lack of water often means drinking (16) not safe. Mr. Engelman says there are problems (17) over the world because of diseases, such as cholera, (18) are carried in water. Lack of water may also result (19) more international conflict. Countries may have to (20) for water in the future. Some countries now get sixty percent of their fresh water from other countries. This is true of Egypt, the Netherlands, Cambodia, Syria, Sudan, and Iraq. And the report says lack of water would affect the ability of developing to improve their economies. This is because new industries often need a large amount of water when they are beginning.
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