This range of questions—from simple problems to those impossibly complex—has resulted in nicknames for various fields of study:“soft” sciences and “hard” sciences.“Soft” sciences admit a great degree of uncertainty.Academicians tend to judge fields such as sociology,psychology,and political science as “soft” because they are assumed to be understandable,of unnecessary mathematical accuracy,and concerned with everyday affairs such as interpersonal relationships.However,“hard” sciences,such as astronomy and chemistry,are said to offer precise answers.Precise definitions for “hard” sciences vary,but the characteristics of “hard” sciences include:producing testable predictions;performing controlled experiments;relying on quantifiable data and mathematical models;a high degree of accuracy and objectivity;and generally applying a pure form of the scientific method.
【语篇导读】本文是科技文章阅读。文章主要讲述科学的不确定性,人们应该有耐心地去等待和观察。
9.We can learn from the passage that .
A.a large planet is able to change the size of a tiny planet
B.ground controllers can affect the gravitational force of planets
C.calculating the probe speeds beyond the solar system is possible
D.predicting the weather is more difficult than predicting the path of a satellite
解析:推理判断题。根据文章第三段的“For example,they think that the gravitational force of a nearby space vehicle,though tiny,is able to change the path of a much larger planet if the vehicle spends enough time close to it.”排除A项;根据文章第三段的“They do this by calculating the gravitational force from each of the passing planets until the probe speeds beyond the edge of the solar system.”排除C项;根据文章第三段的“With the aid of Newton’s laws of gravitational attraction,ground controllers can predict the path of a planetary probe (探测仪)—or satellite—with incredible accuracy.”排除B项;根据第二段的“Because of the unstable and changing state of the earth’s atmosphere,for example,scientists have struggled for centuries to predict the weather with precision(精确) but failed.”判断选D项。
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