last 请版主帮我解释原因，谢谢！

marshial · 发表于 2003-10-1 09:54:00

2. A large number of drivers routinely violate highway speed limits. Since driving at speeds that exceed posted limits is a significant factor in most accidents, installing devices in all cars that prevent those cars from traveling faster than the speed limit would prevent most accidents.
Which one of the following is an assumption on which the argument depends? 23-1-2
(A) a person need not be a trained mechanic to install the device properly
(B) most accidents are caused by inexperienced drivers
(C) a driver seldom needs to exceed the speed limit to avoid an accident when none of the other drivers involved are violating the speed limit
(D) most drivers who exceed the speed limit do so unintentionally
(E) even if the fines for speed-limit violations were increased, the number of such violations would still not be reduced.
21. Nuclear reactors are sometimes built in "geologically quiet" regions, so called by geologists because such regions are distant from plate boundaries and contain only minor faults. Since no minor fault in a geologically quiet region produces an earthquake more often than once in any given 100,000-year period, it follows that of all potential nuclear reactor sites in such a region those that are least likely to be struck by an earthquake are ones located near a fault that has produced an earthquake within living memory.
Which one of the following is an assumption on which the argument depends?
22-1-21
(A) Geologically quiet regions are the least dangerous regions in which to build nuclear reactors.
(B) For any potential nuclear reactor site the likelihood of being struck by an earthquake is the primary determinant of site safety
(C) In a geologically quiet region every potential nuclear reactor site is near at least one minor fault
(D) Nuclear reactors that are located in geologically quiet regions are built to withstand at least one but not necessarily more than one earthquake of minor to moderate force
(E) Earthquake faults in geologically quiet regions produce earthquakes at least once in 100,000 years.
19. Spectroscopic analysis has revealed the existence of frozen nitrogen, methane, and carbon monoxide on the surface of Pluto. Suchices have a tendency to vaporize, producing an atmosphere. Since the proportion of any gas in such an atmosphere depends directly on how readily the corresponding ice vaporizes, astronomers have concluded that the components of Pluto's atmosphere are nitrogen, carbon monoxide, and methane, in order of decreasing abundance.
20-1-19
The astronomers' argument relies on which one of the following assumptions?
(A) There is no more frozen nitrogen on the surface of Pluto than there is either frozen carbon monoxide or methane. 原文并没有比较
(B) Until space probes reach Pluto, direct analysis of the atmosphere is impossible.
(C) There is no frozen substance on the surface of Pluto that vaporizes more readily than methane but less readily than carbon monoxide.
(D) Nitrogen is found in the atmosphere of a planet only if nitrogen ice is found on the surface of that planet.
(E) A mixture of nitrogen, carbon monoxide, and methane is characteristic of the substances from which the Solar System formed.

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last 请版主帮我解释原因，谢谢！

last 请版主帮我解释原因，谢谢！

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