在Windows菜单中，暗淡（灰色）的命令项表示该命令
A．暂时不能用
B．正在执行
C．包含下一层菜单
D．包含对话框
参考答案：A
---- What do you think of Harry, our new roommate?
---- I am not sure, but he is always asking ______ questions and them are very hard to answer.
A．a great many of; a great number of
B．a great many; many of
C．a great number; a great many of
D．a large amount of , many
下列不是骨和含钙组织的脱钙方法的是（）
A.硝酸脱钙法
B.盐酸脱钙法
C.电解脱钙法
D.整合剂脱钙法
E.超声波脱钙法
