题目内容

If Penny does the washing, her sister ___________ the table.

A. has cleared
B. cleared
C. is clearing
D. will clear

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Children arc very curious ___________.

A. at heart
B. on purpose
C. in person
D. by nature

请阐述遗传学的三大定律并以此解释生物的多样性和变异性。

They had two daughters, one a baby,___________a girl of 12.

A. other
B. the other
C. one other
D. another

什么是呼吸作用细胞呼吸的全过程可分为哪几部分