题目

—You bought the car about ten years ago?—Yes.      it’s  old, it still runs well.A．BecauseB．SinceC．AlthoughD．But 答案：C解析: 略一条染色单体含有一条双链DNA分子，那么一个四分体含有 A．两条双链DNA分子               B．四条双链DNA分子 C．一条双链DNA分子               D．一条单链DNA分子