（）对细菌有明显的致死作用，是最有效的灭菌方法。
A.高湿
B.高温
C.低温
D.低湿
参考答案：B
用所给词的适当形式填空。
1. Please give it to ____________ (I).
2. He has ____________ (lot) of friends.
3. John ____________ (do) his homework every night.
4. Why are you ____________ (laugh)?
5. It's easy ____________ (make) mistakes with English.
工程造价的( )关系到多方面的经济利益，同时也对社会宏观经济产生重大影响。
A．大额性 B．单个性C．动态性D．层次性
