__________(64)
A.than
B.before
C.therefore
D.then

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You are aware that the enzyme hunters have been replaced by a new breed of hunters who are tracking genes - the blueprints for each of the enzymes - and are discovering the defective genes that cause inherited diseases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.
How do vitamins influence health?
A.They protect the body from microbes
B.They are broken down by cells to produce energy
C.They keep food from spoiling
D.They are necessary for some enzymes to function

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in the following question.
You should find out as much as about the job and the vacancy.
A.a seat that is available           
B.a job that is available
C.jobs are advertised         
D.an empty seat

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer in each of the following questions.
Were you aware            the regulations against smoking in this area?
A.with                                                   
B.about                         
C.of                               
D.in

Everyone was .............at the soccer match.         (excite)
A.excited
B.exciting
C.unexcited
D.excitedly

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Please don’t  ______ a word of this to anyone else, it’s highly confidential.
A.speak      
B.pass    
C.mutter  
D.breathe

How is a radio-quipped buoy operated?
A.by operators outside the vehicle on a diving platform
B.by operators outside the vehicle in a laboratory on shore
C.by operators inside the vehicle in the part underwater
D.by operators outside the vehicle on ship

In economics, "diminishing returns" describes _________ resource inputs and production.  
A.among     
B.when is it 
C. among them
D.the relationship  between

Mark the letter A, B, C, or D on the top of the first page to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

A.abandon
B. benefit
C.constitute
D. dialect

Mary gave up the job at the advertising agency, .................surprised everybody.
A.which
B.that
C.who
D.where