船舶横摇或纵摇超过（），直升机就难以降落在船舶甲板上。
A.5°
B.10°
C.15°
参考答案：A
句型转换。
1.The man is a famous dancer.(就画线部分提问)
________ ________the man?
2. He went to school when he was eight years old. (改为同义句)
He________ ________to school________he was eight years old.
3. born, he, in, 1981, was, or, 1984 (?) (连词成句)
__________________________________________________
一般来说，对树木年轮生长情况影响最大的是（）。
A.温度
B.湿度
C.空气成分
D.污染物
