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【简答题】
为了保障网络安全，防止外部网对内部网的侵犯，多在内部网络与外部网络之间设置（ ）
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【单选题】How did 'improvisation' come into being?
A.
The blues singers gathered to have contests.
B.
New words were added into old songs.
C.
New styles were played with guitars.
D.
The blues singers created music while playing.
【单选题】"But the blues did occasionally afflict all the adults." Which one is its best paraphrase?
A.
But the blue color did occasionally impress all the adults.
B.
But the blues music did occasionally impress all the adults.
C.
But sadness did occasionally come to all the adults.
D.
But sadness did occasionally make all the adults feel painful.
【单选题】But the blues did occasionally afflict all the adults.
A.
feeling of deep sadness
B.
the color of the sky
C.
sad; depressed
【简答题】Where did the blues first develop?
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