嘧啶核苷酸生物合成时，先合成CMP，再由CMP合成UMP。()
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Based on the ideas presented in the passage we can conclude "being fat" ______in American
A. will always remain a taboo
B. may no longer be a taboo some day
C. has long been a taboo
D. is not considered a taboo by most people
如果函数f(x，y)在(0，0)处连续，那么下列命题正确的是()．
What is the author's main purpose in the passage？
A. To provide information about the childhood of Paul Revere.
B. To discuss the war between the British and the Americans.
C. To tell the reader a story about Paul Revere in the American Revolution.
D. To describe the courage of the farmers and villagers in the American Revolution.
This selection could be entitled______.
A. The Function of Radar
B. Problems in Space Navigation
C. Radar for the Space Age
D. Space Stations
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