孕节
参考答案：
孕节（gravid proglottiD.为绦虫链体后部的节片，其内除充满虫卵的子宫外其它生殖器官均已退化。
Jim didn’t understand ____.
A．which is the way to the museum
B．why his wife always goes shopping
C．what was the way to the museum
D．how I could get to the station
尿素缩合的反应式：（）
