子宫肉瘤的主要临床表现是
A．闭经B．双侧卵巢均增大C．不规则 * * 出血D．清亮腹水E．合并感染
参考答案：C
半径为1cm和2cm的两个圆外切，那么与这两个圆都相切且半径为3cm 的圆的个数是[ ]
A.5个
B.4个
C.3个
D.2个
I have collected ______ information about my project. [ ]
A. a great many
B. a lot
C. a number of
D. huge amounts of
