什么叫“初税亩”制度？
参考答案：即按亩征税的田赋制度。“初”是开始的意思，“税亩”是按耕地的实际亩数收取实物赋税。
For many years, people（）electric cars. However, making them has been more difficult that predicted.
A.had dreamed of
B.have dreamed of
C.dreamed of
D.dream of
精子成熟的部位是（）
A．睾丸
B．精囊、前列腺和 * * 球腺
C．附睾
D．输精管、射精管
E．精索
