在有些植物的成熟花粉粒中的一对精子在大小、形状上和细胞器含量上表现出明显的差异，称为精子的异型性。
参考答案：对
根据下面短文内容，在短文的空格处填上一个恰当的词，使短文完整、通顺。
Ann is my sister. She is a very clever ___小题1:___. And she is very popular. She spends a lot of 小题2: with her friends. They 小题3: go to the parties. She loves to go to the movies. And she 小题4: likes game shows. She loves sports very much, too. Such as basketball, pingpong and so on. She 小题5: like Chinese Cooking or English Today because she thinks they are boring. She doesn’t like studying at 小题6: . She can’t 小题7: reading many books. She doesn’t like to 小题8:to the music, either.
消防安全腰带质量不超过（）kg。
A.0.43
B.0.85
C.0.21
D.0.65
