“鸽子是鸟，所以鸽子会飞。”“鸽子是鸟”是“鸽子会飞”的一个（）。
A.说明
B.条件
C.理由
D.假设
参考答案：C
—How can I improve my memory?
—________
A．Why don’t play concentration games?
B．One thing you could do is play concentration games.
C．What about to play concentration games?
D．It might be a good idea playing concentration games.
肾蒂中没有（）
A.神经
B.淋巴管
C.肾动脉
D.肾静脉
E.肾大盏
