方程(x+1)(x-2)=x+1的解是[ ]
A. x=2
B. x=3
C. x=- 1或 2
D. x= -1或 3
答案：D
在细菌生物学特性中，与芽孢有关的是（）
A.抗吞噬
B.产生毒素
C.耐热
D.粘附于感染部位
E.侵袭力
_____ our representative calls on you next week, he will make you an offer ____ we feel sure will meet with your approval.
A. When, which
B. Who, which
C. When, with that
D. Who, with that
