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举一反三
【单选题】使用SQL语言修改数据库，正确的命令是（）。
A.
CREATE DATABASE
B.
MODIFY DATABASE
C.
ALTER DATABASE
D.
CHANGE DATABASE
【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of making ads louder than the programming. In addition, t...
A.
TV stations always operate at the highest sound levels
B.
their sound levels are kept around peak levels
C.
their sound levels are kept in the middle frequency ranges
D.
unlike regular programs their intensity of sound varies over a wide range
【多选题】皮拉杜斯（Leontius Pilatus, 14世纪人）青年时往来于希腊和意大利各地求学，学成后回到意大利教授希腊语言和文学，他的学生有：
A.
但丁（Dante Alighieri，1265-1321）
B.
彼得拉克（Petrarca, 1304－1374年）
C.
薄伽丘（Boccaccio, 1313－1375年）
D.
赫利索罗拉斯（Manuel Chrysoloras, 1350－1415年）