题目内容
（请给出正确答案）
What is the "critical point" mentioned in the last paragraph？
A．The point at which a computer is an exact copy of a human brain.
B．When a computer can be made as creative as we are.
C．When one computer itself is clever enough to design a better one.
D．When computers destroy each other in an explosion.
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Glaciers are born in rocky womb above the snow line, where there is sufficient winter snowfall and summer cold for snow to survive the annual melting. The long gestation period of a glacier begins with the accumulation and gradual transformation of snow flakes. Soon after they reach the ground, complex snowflakes are reduced to compact, roughly spherical ice crystals, and the basic components of a glacier. As new layers of snow and firm, snow that survives the melting of the previous summer, accumulate, they squeeze out most of the air bubbles trapped within and between the crystals below. This process of recrystallization continues throughout the life of the glacier.
The length of time required for the creation of glacier ice depends mainly upon the temperature and the rate of snowfall. In Iceland, where snowfall is heavy and summer temperatures are high enough to produce plenty of melt--water, glacier ice may come into being in a relatively short time--say, ten years. In parts of Antarctica, where snowfall is scant and the ice remains well below its melting temperature year round, the process may require hundreds of years.
The ice does not become a glacier until it moves under its own weight, and it cannot move significantly until it reaches a critical thickness--the point at which the weight of the piled-up layers overcomes the internal strength of the ice and the friction between the ice and the ground. This critica} thickness is about 60 feet. The fastest moving glaciers have been gauged at not much more than two and a half miles per year, and some cover less than 1/100 inch in that same amount of time. But no matter how infinitesimal the flow, movement is what distinguishes a glacier from a mere mass of ice.
Which of the following is NOT true about glaciers？
A．Glaciers are diversified in shapes and sizes.
B．Glaciers can be divided into valley glaciers and ice sheets.
C．Glaciers are remnants of great shrouds of ice that covered the earth years ago.
D．Few glaciers have a long history.
A．According to what people play.
B．According to what people do.
C．According to what people need.
D．According to what people have.
A.what it takes
B.what takes it
C.what they take
D.what takes them
A.who，what
B.what，what
C.what，who
D.who，who
What is the author's attitude towards Russia？
A．Suggestive.
B．Prejudicial.
C．Sympathetic.
D．Objective.
A.What in earth
B.where in earth
C.What on earth
D.Where on earth
What is the author's attitude toward "educational toys"？
A．Indifferent.
B．Negative.
C．Positive.
D．Tolerant.
A.What for？
B.So what？
C.What about you？
