题干
I prefer a school ______teachers have to work as a team, instead of fighting against each other.
A：where
B：that
C：a
D：whe
答案(点此获取答案解析）
A
的展开式中，二项式系数最大项的系数为（ ）
。则下列叙述正确的是
雌配子，每条染色体的DNA含量对应丁图的BC段