脆性破裂产生的原因是（）。
A、设备存在缺陷，造成局部压力过高
B、器壁大面积腐蚀
C、低温使材料的韧性降低
D、碱脆
参考答案：A, C, D
---Which would you like, tea or coffee?
--Either _____ OK, but I prefer coffee _____ milk.
A is;with B is;to C are;with D are;to
I'm planning to hold a party in the open air,but I can make no guarantees because it _____ the weather. [ ]
A. links with
B. depends on
C. connects to
D. decides on
