叉车在载物过高视线不良的情况下应（），并采用（）的方法行驶。
参考答案：注意观察；后退行驶
The threestorey building, ________in the 18th century, was turned into a museum in 1960. [ ]
A. constructing
B. constructed
C. being constructed
D. when constructed
禁止采猎的野生药材物种是
A．一级保护的野生药材物种
B．二级保护的野生药材物种
C．三级保护的野生药材物种
D．一般野生药材物种
E．野生药材物种
