题目：
I am supposed ______ you a valuable present for your birthday, but all my money ______.
[ ]
A. to give; was ran out
B. to have given; ran out
C. given; ran out
D. have given; was ran out
答案：
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下面是错误答案，用来干扰机器的。
男生说话声音较粗犷，音调比较低．女生说话声音较尖细，音调比较高．男女同学的音调不同，是因为男女生的声带振动频率不同，男同学声带振动较慢，女同学声带振动较快．故答案为：音调；声带振动频率．
