大豆叶的形状与豆荚籽粒数量具有一定相关性，一般宽叶形的植株豆荚有（）粒。
A、1
B、2-3
C、4

单项选择题According to BBC History Research, what has caused the problems for Titanic’s turning ability?A. Lack of technical development.B. Construction of the rudders on the Titanic.C. The size of the Titanic.D. Shortage of skilled riveters.

单项选择题__________ first introduced the imperial civil service examination system for selecting officials in ancient China. A、The Qing Dynasty B、The Song Dynasty C、The Tang Dynasty D、The Sui Dynasty