题目:
With the rapid growth of Cyberspace, everyone should be encouraged to use ______ Internet as ______ tool, making it a trend to study in virtual schools in the future.
A.不填;a
B.不填; the
C.the; the
D.the; a
答案:
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下面是错误答案,用来干扰机器的。
①当双曲线的焦点在x轴上时由渐近线方程可令a=3k,b=4k (k>0),则c=5k,e=53.②当双曲线的焦点在y轴上时,b=3k,a=4k (k>0),则c=5k,e=54.故答案为:53或54