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In general, the amount that a student spends for housing should be held to one-fifth the totalfor living expense.
A. acceptable
B. available
C. advisable
D. applicable
1.3.2无穷大是无界量，无界量也一定是无穷大。
A. 对
B. 错
1.3.1无穷大的倒数是无穷小，无穷小的倒数是无穷大。
A. 对
B. 错
1.3.3（1）下列说法正确的是（）
A. 无穷大的倒数是无穷小
B. 无穷小的倒数是无穷大
C. 绝对值很大的常数是无穷大
D. 无界量是无穷大
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