[单项选择]

Within 80 years, some scientists estimate, the world must produce more than eight times the present world food supply. The productiveness of the sea raises our hopes for an adequate food supply in the future. Aided by men of science, we have set forth to find out that 70 percent of the earth remains unexplored--the ocean depths. Thus, we may better discover and utilize the sea’s natural products for the world’s hungry.
It is fish protein concentrate that is sought from the seas. By utilizing the unharvested fish in United States waters alone, enough fish protein concentrate can be obtained to provide supplemental animal protein for more than one billion people for one year at the cost of less than half a cent per day per person. The malnutrition of children is terribly tragic. But the crime lies in society’s unrestrained breeding, not in its negligence in producing fish powder. But wherever the population projects are carefully considered, the answer to
A. the oceans will help to provide enough food for the world in the future
B. thirty million tons of food products are taken from the sea every year
C. city sewers are pouring forth polluted matter into bays and coastal waters
D. a steady increase in population will result in more hungry mouths to feed

[单项选择]

Within 80 years, some scientists estimate, the world must produce more than eight times the present world food supply. The productiveness of the sea raises our hopes for an adequate food supply in the future. Aided by men of science, we have set forth to find out that 70 percent of the earth remains unexplored the ocean depths. Thus, we may better discover and utilize the sea’s natural products for the world’s hungry.
It is fish protein concentrate that is sought from the seas. By utilizing the unharvested fish in United States waters alone, enough fish protein concentrate can, be obtained to provide supplemental animal protein for more than one billion people for one year at the cost of less than half a cent per day per person. The malnutrition of children is terribly tragic. But the crime lies in society’s unrestrained breeding, not in its negligence in producing fish powder. But wherever the population projects are carefully considered, the answer to
A. Though the situation is not urgent, we should press forward with our marine research.
B. Nations throughout the world must be provided with fish, fresh or frozen, for needed protein.
C. There are enough fish in the U. S. seas to allow for the annual protein needs of a quarter of the world’s 5 billion people.
D. The oceans are the major source of the world’s protein supply.

[单项选择]Scientists estimate that about 530,000 other objects, too small to detect with radar, （　） the Earth too.
A. being circled
B. are circling
C. are to be circling
D. are being circled

[填空题]Scientists estimate ______ (还要过很多年这种药才能用在人身上).

[单项选择]Passage Three
Within fifteen years Britain and other nations should be well on with the building of huge industrial complexes for the recycling of waste. The word rubbish could lose its meaning because everything which goes into the dustbin would be made into something useful. Even the most dangerous and unpleasant wastes would provide energy if nothing else.
The new concept of recycling waste is taking shape at the British technological laboratory at Warren Spring, not far from the north of London. Today, the laboratory spends four times as much money in studying recycling as it did five years ago.
The latest project is to take a city of around half a million inhabitants and discover exactly what raw materials go into it and what go out. The aim is to find out how much of these raw materials could be provided if a plant for recycling waste were built just outside the city. This plant would recycle not only metal such as steel, lead and copper, but
A. A．1) probably means ______ finished withB. nearing completionC. getting ready to startD. making improvements on

[单项选择] Within fifteen years Britain and other nations should be well on with the building of huge industrial architectures for the recycling of waste. The word rubbish could lose its meaning because everything which goes into the dumps would be made into something useful. Even the most dangerous and unpleasant wastes would provide energy if nothing else. The latest project is to take a city of around half a million residents and discover exactly what raw materials go into it and what go out. The aim is to find out how much of these raw materials could be provided if a plant for recycling waste were built just outside the city. This plant would recycle not only metal such as steel, lead and copper, but also paper and rubber as well. Another new project is being set up to discover the best ways of sorting and separating the rubbish. When this project is completed, the rubbish will be processed like this: first, it will pass through a powerful fan to separate the lightest elements fr
A. be built in Britain
B. appear in 15 years
C. take us 15 years to build them
D. be found only in some big cities