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46、 What happens after a star dies?
A．It becomes invisible．
B．It falls to Earth．
C．It burns up all of its gases．
D．It becomes brighter and easier to see．


47、 Why can't you see light when you look at a black hole?
A．Because most black holes are so far away．
B．Because the gravity of a black hole is so strong that it sucks the light inward．
C．Because as the star's gases burn, it stops giving off heat and light．
D．Because as a star cools, its outer layers pull in toward its center.

48、回答48-67题
Many of the problems we face today are not so new as we think they are．And some of our modern solutions are not so new, either．The problem of energy shortages and the solution of using solar energy go back at least to early Greek cultures．The climate in the coastal areas of Greece 2,500 years ago was characterized by cool winters, much as it is today．At that time, the Greeks heated their homes with small, charcoal-burning heaters．In other words, wood (which is used to make charcoal) was their primary source of energy．However, by the fifth century BC fuel shortages had become common because, in many parts of Greece, the firewood in the forests had been depleted．Once the supply of firewood from the local forests ran out, people began to use the wood from olive groves as fuel．But this solution had its own problem．It reduced the olive crop, a valuable resource to the Greeks．By the fourth century BC, the city of Athens banned the use of olive wood for fuel．Wood had to be imported from farther and farther away, making it more difficult to obtain and more expensive to use．About this time the Greeks began to build their houses facing south, so that the low sun in winter could penetrate and help heat the interiors．Excavations of ancient Greek cities suggest that large areas were planned so that individual homes could take maximum advantage of passive solar energy．

The word "depleted" means________
A．damaged
B．stolen
C．used up
D．discovered


49、 According to the passage,________
A．using wood from the olive groves in ancient Greece was a sensible solution to the fuel problem
B．using passive solar energy was more expensive than using wood in ancient Greece
C．the ancient Greeks planted new forests to replace the ones they cut down for firewood
D．the concept of using passive solar energy has been around since at least the fourth century BC


50、 The author implies that before the fifth century BC,________
A．the climate was much milder in the coastal areas of Greece
B．the Greeks were very careful to replant their forests after they cut them
C．the Greeks were not concerned about conserving their energy sources
D．olives were not an important resource to the Greeks


51、 Which sentence best expresses the central point of the passage?
A．Sentence 1．
B．Sentence 2．
C．Sentence 3．
D．Sentence 4．

52、回答52-71题
The pines belong to the coniferous(结球果的) class of trees; that is, trees which bear cones．The pines may be told from the other coniferous trees by their leaves, which are in the form of needles two inches or more in length．These needles keep green throughout the entire year．This is characteristic of all coniferous trees, except the larch and cypress, which shed their leaves in winter．The pines are widely distributed throughout the Northern Hemisphere, and include about 80distinct species with over 600 varieties．The species enumerated here are especially common in the eastern part of the United States, growing either native in the forest or under cultivation in the parks．The pines form a very important class of timber trees and produce beautiful effects when planted in groups in the parks．How to tell them from each other: The pine needles are arranged in clusters．Each species has a　certain characteristic number of needles to the cluster and this fact generally provides the simplest and most direct way of distinguishing the different pines．In the white pine there are five needles to each cluster, in the pitch pine three, and in the Scotch　pine two．The Austrian pine also has two needles to the cluster, but the difference in size and character of the needles will distinguish this species from the Scotch pine．

Which of the following statements is not a fact?
A．Pine trees are classified as coniferous．
B．Most pine trees remain green all year．
C．Pine trees are more useful for timber than for landscaping．
D．Pines are found throughout the Northern Hemisphere．


53、 Which of the following trait is common to pine trees?
A．They differ among themselves by shades of green．
B．Their pine needles are arranged in clusters．
C．They are most common to the western United States．
D．They have different numbers of branches．


54、
How are larch and cypress trees different from other pine trees?
A．They have an odd number of pine needles per cluster．
B．They shed their leaves in winter．
C．Their pine needles are longer than other varieties．
D．They are only found in cultivated parks．


55、
Which pattern of organization is used?
A．Comparison/contrast．
B．Cause/effect．
C．Order of importance．
D．Spatial order．

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