生物与环境的相互影响，相互作用，构成了（ ）
A、生态系统 B、大气圈 C 、水圈
答案：A
生物与环境所形成的统一整体叫做生态系统。
When the old woman was to cross the street, she was knocked down by a car and badly ______.
A．destroyed
B．wounded
C．damaged
D．injured
当航迹舵在自动校正风流压影响的航向修正量大于（）时应发出警报。
A.5度
B.10度
C.15度
D.20度
