Which two rings show the weather 12 years ago？
A. The eleventh and twelfth ring from outside to inside.
B. The eleventh and twelfth rings from inside to outside.
C. The twelfth and thirteenth rings from outside to inside.
Maddy's father is saved at last.
A. Right.
B. Wrong.
C. Doesn't say.
【B10】
A. cooling
B. cool
C. cooled
没PC中单字节带符号的整数是A=01001110，B=11100001，则A-B的结果是______。
A. 01101101
B. 00101111
C. 10010001
D. 00101101
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