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truongmadridista
2 năm trước
The bus was plenty of people who had spent many a happy hour in the stores doing  their Christmas shopping.
A.was plenty of
B.many a happy hour
C.doing
D. their
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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best each of the numbered blanks.
      Most people think of computers as very modern inventions, products of our new technological age. But actually the idea for a computer had been worked out over two centuries ago by a man (39)_________ Charles Babbage. Babbage was bom in 1791 and grew up to be a brilliant mathematician. He drew up plans for several calculating machines which he called "engines". But despite the fact that he (40)_________ building some of these, he never finished any of them. Over the years, people have argued (41)_________ his machines would ever work. Recently, however, the Science Museum in London has finished building (42)_________ engine based on one of Babbage's designs. (43)_________ has taken six years to complete and more than four thousand parts have been specially made.
       Whether it works or not, the machine will be on show at a special exhibition in the Science Museum to remind people of Babbage's work.
(43) 
A.They           
B.It     
C.One            
D.He

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.
The first two decades of this century were dominated by the microbe hunters. These hunters had tracked down one after another of the microbes responsible for the most dreaded scourges of many centuries: tuberculosis, cholera, diphtheria. But there remained some terrible diseases for which no microbe could be incriminated: scurvy, pellagra, rickets, beriberi. Then it was discovered that these diseases were caused by the lack of vitamins, a trace substance in the diet. The diseases could be prevented or cured by consuming foods that contained the vitamins. And so in the decades of the 1920's and 1930's, nutrition became a science and the vitamin hunters replaced the microbe hunters.
In the 1940's and 1950's, biochemists strived to learn why each of the vitamins was essential for health. They discovered that key enzymes in metabolism depend on one or another of the vitamins as coenzymes to perform the chemistry that provides cells with energy for growth and function. Now, these enzyme hunters occupied center stage.
You are aware that the enzyme hunters have been replaced by a new breed of hunters who are tracking genes - the blueprints for each of the enzymes - and are discovering the defective genes that cause inherited diseases - diabetes, cystic fibrosis. These gene hunters, or genetic engineers, use recombinant DNA technology to identify and clone genes and introduce them into bacterial cells and plants to create factories for the massive production of hormones and vaccines for medicine and for better crops for agriculture. Biotechnology has become a multibilliondollar industry.
In view of the inexorable progress in science, we can expect that the gene hunters will be replaced in the spotlight. When and by whom? Which kind of hunter will dominate the scene in the last decade of our waning century and in the early decades of the next? I wonder whether the hunters who will occupy the spotlight will be neurobiologists who apply the techniques of the enzyme and gene hunters to the funtions of the brain. What to call them? The head hunters. I  will return to them later.
With which of the following statements would the author be most likely to agree?
A.Most diseases are caused by defective genes
B.The focus of medical research will change in the next two decades.
C.Medical research throughout the twentieth century has been dominated by microbe hunters.
D.Medical breakthroughs often depend on luck.

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