胎儿肾脏最常见畸形是（）。
A.多囊肾
B.肾脏缺如
C.游走肾
D.肾多发囊肿
E.肾发育不良
参考答案：A
The key you have just got the front door.
A．is used to opening
B．is used to be opened
C．is used to being opened
D．is used to open
When his wife died, he lived ______; his lovely pet dog made him feel less ______.
A．alone, alone
B．lonely; alone
C．lonely; lonely
D．alone; lonely
