妊娠滋养细胞疾病不包括
A．绒癌
B．葡萄胎
C．侵蚀性葡萄胎
D．胎盘部位滋养细胞肿瘤
E．卵巢绒癌
参考答案：E
If all business goes paperless, at least one million tons of paper will be ______ a year. [ ]
A. used
B. saved
C. copied
D. offered
