胶轮车空气过滤器受堵，发动机会出现什么现象（）
A、发动机无力，启动困难
B、不受影响
C、点火时间过晚
D、无任何反应
参考答案：A
Directions:
Study the following drawing carefully and write an essay in which you should
(1) describe the drawing,
(2) interpret its meaning, and
(3) give your comments.
进境动物和动物产品应在贸易合同或协议签订前办妥检疫审批手续，检疫审批有效期为一个月。( )
