English _________ in Canada, Australia and New Zealand as well as America and Britain.

        [ ]

A. speaks        

B. is speaking

C. is spoken      

D. spoke

当杆件两端受到大小相等，方向相反、作用线与杆轴线重合的两个压力作用时，杆件产生的变形叫（）变形。

A、拉伸

B、弯曲

C、剪切

D、压缩