存查煤样应在原始煤样制备的同时，于制样过程中的任一阶段分取。

—We were surprised to hear that the reason ________ she gave for her absence was ________ her mother was ill.

—Yes.We saw her mother was at the supermarket that morning.

A．why；that

B．which；that

C．that；because

D．why；because

市场预测的核心内容是（）

路得原来的丈夫是玛伦，后来她又嫁给了谁为妻？生了儿子名叫什么？

国际标准化组织（ISO）于1984年颁布了开放系统互连（OSI）参考模型？

肱骨外上髁炎的病因，主要是

A．急性化脓性感染

B．结核

C．类风湿

D．风湿

E．慢性损伤