试题与答案

全球变暖已经日益威胁到生物的生存,图为一对北极熊母子无助地坐在一块不断融化缩小的

题型:选择题

题目:

全球变暖已经日益威胁到生物的生存,图为一对北极熊母子无助地坐在一块不断融化缩小的浮冰上。若浮冰和北极熊始终处于漂浮状态,则随着浮冰的融化

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A.浮冰受到的浮力在增大

B.浮冰受到的浮力大小不变

C.浮冰在水中的体积在减小

D.北极熊受到的支持力在减小

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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题型:问答题

Passage 1 The US dollar value of Chinese exports increased at an average rate of almost 18 per cent per annum between 1978 and 1983, while imports increased by approximately 11 per cent per annum. As a result, the visible trade surplus rose sharply from US $1.4 billion in 1981 to US $4.4 billion in 1982 and US$3.7 billion in 1983. Exports grew much faster than imports during this period not only because of the p emphasis placed on exporting by China’s economic planners, but also because a number of industrial projects were postponed in 1979. Official recognition that foreign technology could play a major role in modernising the Chinese economy had caused imports to rise by more than 50 per cent in 1978 placing undue strain on the national economy. Grain imports have fallen sharply over the past few years—China became a net grain exporter in 1984—and in 1983 the country started to export soyabeans and cotton.

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