下列哪项不是乳腺纤维腺瘤的特征（）
A.好发于外上象限
B.多数为单发性
C.直径在1～5cm间
D.是圆形、椭圆形
E.月经期肿块明显增大
参考答案：E
"We can’t go out in this weather," said Bob, ______ out of the window. [ ]
A. looking
B. to look
C. looked
D. having looked
高比特率数字用户环路（HDSL）中用（）能对双绞绞铜线来传输T1/E1速率信号.
A.1
B.2
C.4
