搜题请搜索小程序“爱下问搜题”
问题
单项选择题
免疫球蛋白/抗体缺陷为主者，占整个原发性免疫缺陷病的
A．80%
B．60%
C．50%
D．30%
E．10%
答案
参考答案：
C
选择题
Although Linda was blind, she practiced ________ the piano very hard and later became a successful
pianist.
A. playing
B. to playing
C. to play
D. played
查看答案
单项选择题
教育信息化要服务于教育（）。
A.现代化
B.系统化
C.产业化
D.规模化
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