It is time we stared to think seriously about the growing shortage of raw materials in the
A. stop
B. stopped
C. to stop
D. would stop
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抗癫痫药物开始治疗时,从总量的多少开始
A. 1/3~1/2
B. 1/2~2/3
C. 2/3~3/4
D. 全量
E. 以上都不是
Galileo found it difficult to believe that the sun rotated around the earth and the earth______the center of the universe.
A. to be
B. is
C. was
D. would be
化脓性脑膜炎治疗时的疗程应不少于
A. 1~2周
B. 2~3周
C. 3~4周
D. 4~6周
E. 5~6周