56. The pupose of the experiments with hamsters was to A. find out how the clock works B. locate the clock ock In hamsters D. explore the possibility of altering the clock 57. What might be one of the implications of the findings? A. To change people s biological rhythms for different jobs B. To make better use of the brain C. To help people sleep well D. To suit people to the pace of modern life. 58. Which of the following is true according to the passage? A. The biological clock is different among hamsters. B. The biological clock is automatic and can t be altered C. The biological rhythms can be altered with operation. D. The scn is the central part of the nervous system. t is often claimed that nuclear energy is something we cannot do without. We live in a consumer society, where there is ormous demand for commercial products of all kinds Moreover, an increase in industrial production is considered to be one solution to the probl of mass unemployment. Such an increase presumes an abundant and cheap energy supply Many people lieve that nuclear energy provides an inexhaustible and economical source of power and that it is therefore essential for an industrially developing society. There are a number of other advantages in the use of nuclear energy. Firstly, nuclear power, except for accidents, is clean. A further advantage is that a nuclear power station can be run and maintained by relatively few technical and administrative staff. The nuclear reactor represents an enormous step in our ientific evolution and, whatever the anti nuclear group says, it is wrong to expect a return to more primitive sources of fuel. However, opponents of nuclear energy point out that nuclear power stations bring a direct threat not only to the environment but also to civil liberties. Furthermore, it is questionable whether ultimately unclear power is a cheap source of energy. There have, for example, been very costly accidents in America, in Britain and, of course, in Russia. The possibility of increases in the cost of uranium in addition to the cost of greater safety provisions could price nuclear power out of the market. In the long run, environmentalists argue, nuclear energy may bring about the destruction of the human race. Thus, if we wish to survive, we cannot afford nuclear energy. In spite of the case against nuclear energy out lined above, nuclear energy programmes are expanding. Such an expansion assumes a continual growth in industrial production and consumer demands. However, it is doubt ful whether this growth will or can continue. Having weighed up the arguments on both sides, it seems there are good economic and ecological reasons for sources of energy other than nuclear power. 59. The writer's attitude toward nuclear energy A. negative56. The pupose of the experiments with hamsters was to _____ . A．find out how the clock works B．locate the clock C．compare two kinds of clock in hamsters D．explore the possibility of altering the clock 57. What might be one of the implications of the findings? A．To change people's biological rhythms for different jobs. B．To make better use of the brain. C．To help people sleep well. D．To suit people to the pace of modern life. 58. Which of the following is TRUE according to the passage? A．The biological clock is different among hamsters. B．The biological clock is automatic and can't be altered. C．The biological rhythms can be altered with operation. D．The SCN is the central part of the nervous system. Passage 3 It is often claimed that nuclear energy is something we cannot do without. We live in a consumer society, where there is an enormous demand for commercial products of all kinds. Moreover, an increase in industrial production is considered to be one solution to the problem of mass unemployment. Such an increase presumes an abundant and cheap energy supply Many people believe that nuclear energy provides an inexhaustible and economical source of power and that it is therefore essential for an industrially developing society. There are a number of other advantages in the use of nuclear energy. Firstly, nuclear power, except for accidents, is clean. A further advantage is that a nuclear power station can be run and maintained by relatively few technical and administrative staff. The nuclear reactor represents an enormous step in our scientific evolution and, whatever the anti nuclear group says, it is wrong to expect a return to more primitive sources of fuel. However, opponents of nuclear energy point out that nuclear power stations bring a direct threat not only to the environment but also to civil liberties. Furthermore, it is questionable whether ultimately unclear power is a cheap source of energy. There have, for example, been very costly accidents in America, in Britain and, of course, in Russia. The possibility of increases in the cost of uraniun in addition to the cost of greater safety provisions could price nuclear power out of the market. In the long run, environmentalists argue, nuclear energy may bring about the destruction of the human race. Thus, if we wish to survive, we cannot afford nuclear energy. In spite of the case against nuclear energy outlined above, nuclear energy programmes are expanding. Such an expansion assumes a continual growth in industrial production and consumer demands. However, it is doubtful whether this growth will or can continue. Having weighed up the arguments on both sides, it seems there are good economic and ecological reasons for sources of energy other than nuclear power. 59. The writer's attitude toward nuclear energy is _____ . A．negative