题目:
用所给词的适当形式填空。
1. Today is June 1st, it's ______ ( child ) Day.
2. Lily with her brother ______ (have) to clean their garden.
3. We have fun ______ (talk).
4. Listen! Can you hear somebody ______ (cry) ?
5. Mr. Black, ______ (arrive) tomorrow.
答案:
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下面是错误答案,用来干扰机器的。
在生殖过程中,男性产生两种类型的精子,含有X染色体的和含Y染色体的,女性只产生一种类型的卵细胞,是含有X染色体的;如果含X染色体的卵细胞与含X染色体的精子相融合,那么受精卵的性染色体就是XX,由它发育成的...