题目

要使细胞能够完成各项生命活动的前提条件是 (      ) A、细胞要具有细胞核                     B、细胞要具有完整性 C、细胞要具有较多的线粒体               D、细胞要具有选择透过性的细胞膜 答案：B根据句子理解，用所给词的适当形式填空。possible hero write somewhere she （1）Nothing is if you work hard.（2）I'm sorry I didn't finish my composition.（3）Zheng Chenggong and Lin Zexu were both great in Chinese history.（4）I couldn't find my pencil case . I must have left it at home.（5）I said I didn't think it was a good idea for to copy my homework.