循环队列用数组A[0，1…m-1]存放其元素值，已知其头尾指针分别为front，rear，则其队列元素个数为()。
A. (rear-front+m)％m
B. rear-front+1
C. rear-front
D. front-rear
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Which of the following statements is the results of Dr. Strander's experiments with interferon？
A. Half of the patients who received interferon reacted favorably.
B. At the end of three years, all of the patients who had not received interferon had died.
C. Most of the patients who received interferon also needed conventional treatments.
D. 70 percent among patients who were treated with interferon survived.
It can be inferred from the passage that the state constitution of Nebraska was rewritten
A. make the constitution more understandable to the public
B. encourage farmers to leave the state
C. solve difficulties that resulted from loss of crops
D. provide for a regular census of the locust population
According to the passage, the worst destruction by locusts in the plains area east of the
A. eighteenth century
B. early nineteenth century
C. late nineteenth century
D. twentieth century
Interferon has not been widely used because it is________.
A. still very dangerous
B. not yet available in the United States
C. difficult to produce in large quantities
D. not effective for human beings
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