（）对矿物质钙的需要量最高。
A、肉用仔鸡
B、乳牛
C、产蛋鸡
D、种公猪
参考答案：C
已知直线斜率的绝对值等于１，直线的倾斜角 ．
I feel quite confident in Mr Jackson to you for the vacant post of researcL assistant. [ ]
A. submitting
B. proclaiming
C. recalling
D. recommending
