合同拷贝操作在哪个环节（）。
A.合同准备环节
B.合同订立环节
C.合同履行环节
D.合同终结环节
参考答案：A
_____ this village is extremely poor, the people think it is so important to keep the school going.[ ]
A. So long as
B. Just as
C. Even though
D. No matter how
引起血小板减少的疾患是（）
A.急性出血后
B.脾功能亢进
C.脾切除术后
D.真性红细胞增多症
E.急性化脓性感染
