【正文】 e wondering what these colors are for. For years, scientists have worked to understand the changes that happen to trees in the autumn. Up to now there have been different explanations for why natural selection makes autumn colors so widespread. Dr. Hamilton from Oxford University proposed that bright autumn leaves contained a message: they warn insects to leave them alone. In autumn, insects choose trees where they will lay eggs. When the larvae (幼蟲) e out the next spring, they feed on the trees, often with a result of destruction of the trees. Dr. Hamilton suggested that trees could ward off these insects with poisons. They could have strong defenses by letting egglaying insects know what was in store for their eggs. Dr. Hamilton and his students turned the theory into a mathematical model, which showed that warning signals could indeed drive the evolution (進(jìn)化) of bright leaves. It was a first attempt to see what was out there.A research team from the University of Wisconsin gave a quite different explanation. “If you are up here in Wisconsin, by the time the leaves change, all the insects that feed on leaves are gone,” Dr. Hoch said. He believed that autumn colors served mainly as protection. According to Dr. Hoch and his team, autumn colors might be able to protect the leaves from sun damage or frost (冰凍) injury—in other words, they actually act as a sunscreen to avoid the destruction to the leaves. Besides, autumn colors might protect the leaves from water loss. If the cells in the leaves bee dry, the connections between the cells will be weakened and the leaves will break off. Although there are different explanations about autumn colors, it has really given them a deeper concern for this time of year. “People sometimes say that science makes the world less interesting by just explaining things away,” one famous biologist said. “But with autumn leaves, the more you know about them, the more amazed you are.” 63. According to Dr. Hamilton, there is a connection between ______.A. the size of leaves and the survival of insects B. the size of leaves and the behavior of insectsC. the color of leaves and the quality of insectsD. the color of leaves and the number of insects64. Dr. Hoch and his team give the explanation that ______.A. climate has an influence on the color of the leavesB. sun damage and frost injury drive the insects awayC. the color of autumn leaves has a protective functionD. autumn colors bring great destruction to the leaves65. The underlined phrase “ward off” in Paragraph 2 probably means ______.A. catch B. attract C. ignore D. prevent 66. Which of the following shows the organization of the passage?P 2Sp 2Sp 1CP 1CPP 1CPSp 1Sp 2CP 2A． B． P 1CPSp 2CSp 1Sp 2P 2Sp 1C． D． P 1CPCP 2P 3 CP: Central Point P: Point Sp: Subpoint (次要點(diǎn)) C: ConclusionDMean Machines?“If popular culture has taught us anything, it is that someday mankind must face and destroy the growing harm caused by robots.” Author Daniel Wilson’s description of How to Survive a Robot Uprising seems like it is straight out of a robot disaster movie. “The problem with cleverlydesigned robots is that we bee dependent on them,” says Wilson. The classic movie Westworld describes an amusement park where, after a safety error, the robots spend a killing period of time. Yet in reality, statistics show that as technology improves there is a trend towards increased safety. Similarly, public transport systems using puters and machines are believed to be more reliable than those in human control, and a robotassisted operation is more precise and results in fewer medical problems. But where does the idea of robots being cruel and harmful e from? “Robots were pop culture figures before they existed,” says Wilson. “They were frightening creatures in novels. When robots really started existing, they already had this image (形象) set up not based on reality. That’s exactly what happened—a movie monster became real.”Recent reports talked of a robot “attack” on a worker in Sweden. Even if these references to an attack rather than an error are meant in joke, this only makes the problem worse. “We’re so interested in the robotattack storyline that it can influence the way real robotsafety problems are discussed,” says one journalist. But with robots being increasingly advanced, is it going to e a time when an error could bee an unkind and cruel attack?“Robots are just a bunch of metal,” says one engineer. “If you are scared, then you are scared of the people building them.” So what do engineers think we should be afraid of? Nanotechnology is the science which involves developing and making extremely small but very powerful machines. Some engineers suggest that with these new developments e “severe dangers” if they are used inappropriately. Its theory goes that “the small size and rapid potential of nanobuilt weaponry (武器) will make it difficult to control and hard to keep out of the hands of terrorists.” And this is a view shared by some artificial intelligence experts. “With robots… if it makes an error, you can unplug it and shut it down. But if you have lots of nanobuilt weapons, which are extremely small, there is no way you can do the same thing.” 67. In the first paragraph, Daniel Wilson ______.A. confirms the existence of robotsB. introduces the development of robotsC. states that robots are potentially dangerousD. suggests that we should be dependent on robots 68. People have e to think of robots as something bad because ______.A. designers of the first robots spread this ideaB. reality shows they are the same as in the moviesC. movie audience continue to give this impressionD. they were originally described this way in novels69. The author believes that the report of the robo