下列哪些属于宫外孕（）
A.阔韧带妊娠
B.宫颈妊娠
C.子宫残角妊娠
D.腹腔妊娠
E.卵巢妊娠
参考答案：A, D, E
—_____ does she visit her parents?
—Once a month.
A. How often
B. How long
C. How
