预计采购金额小于（）万元的，物资采购方案可结合合同审批环节一起进行。
A.20
B.30
C.40
D.50
参考答案：B
用所给单词的适当形式填空。
1. When we visit the Tian'anmen Square, we are _____ (excite) about it．
2. Have you _____ (be) to the Great Wall?
3. It's about 6,400 _____ (kilometer) long.
4. Qomolangma is the _____ (high) mountain in the world.
5. Have you heard of the Empire State _____ (build) which is in the centre of
New York?
慢性胃溃疡经久难愈的局部因素主要是（）
A.局部溃疡过大
B.局部溃疡过深
C.溃疡周边组织水肿
D.溃疡底部神经纤维变性、断裂
E.溃疡底部小动脉增生性内膜炎
