图示铰链四杆机构属于（）机构类型。
A．曲柄摇杆机构
B．双曲柄机构
C．双摇杆机构
D．摇杆曲柄机构
参考答案：C
She_______to beat the world record,but failed at last.[ ]
A. offered
B. prepared
C. attempted
D. went
