问题
选择题
There are _____ books on the desk, but there aren't _____ rulers.[ ]
A. any, some
B. some, much
C. some, any
答案
答案：C
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There are _____ books on the desk, but there aren't _____ rulers.[ ]
A. any, some
B. some, much
C. some, any
答案：C
(-π≤θ≤π)，试求：
.