知识创新的主要阶段包括（）。
A.选题立项
B.发现问题
C.创新成果的展示
D.研究问题的解决
参考答案：A, B, C, D
用方框中所给单词的适当形式填空，每词仅用一次。
小题1:Tom is my good friend and he often helps me ______ my English.
小题2:Look! The old man ______ a big box. Let’s give him a hand.
小题3:Let’s go to the _________ today. I want to watch a movie about sharks.
小题4:She could _______ move because she got badly injured in the earthquake.
小题5:The weather today is much ________ than that of yesterday.
钢材表面经轻度的喷射或抛射除锈后，其表面已无可见的油脂和污垢，且没有附着不牢的氧化皮、铁锈和油漆涂层等，此钢材表面除锈质量等级为（）级。
A．St2
B．St3
C．Sa1
D．Sa2
