挑选最佳答案回答所听到的问题( )
A:She can't stay out late.
B:She can't go out to play.
C:She can't stay up late.
下列关于生物大分子的结构和功能的叙述中,正确的是( )
根据句子意思,用括号中所给词的正确形式填空,每空填一词。
Humans ____(pollute) the earth all the time and there is not enough clean air and water.