查字典填空。

①“疾”字的部首是____，在字典里的解释有：A.疾病；B.痛恨；C.急速。“疾步”中的“疾” 应取第____解释；“疾步”的意思是：____

②“绝”字用音序查先查字母____，在字典的解释有：A.断绝；B.穷尽，完全没有了；C.绝对；D.极，最。“绝望”的“绝”应取的解释是：____。

③“昔”字用音序查，字母是____，部首是____，“昔日”的意思是____。

用四舍五入法取近似数，18042000≈____（精确到万位）

根据下图判断，下列描述最符合澳大利亚地势特征的是（    ）

如图，在半径为4cm的⊙O中，劣弧AB的长为2πcm，则∠C=____ 度．

    Bob is a lovely schoolboy. He likes playing football very much. He often plays football with his classmates after school, but he never goes home too late. He usually gets home between 4:30 and 5:30 in the afternoon. One day he comes back home late, so his mother says, ”You come back home late today, Bob!””Yes, we have got a new teacher. He teaches us Maths,” Bob answers. “How is he?”his mother asks. “I don't know. I think I can't believe him.””Why?”his mother says. “In today's Maths class, one moment he says two and three is five. But the next moment he says one and four is five.” Bob answers.