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【单选题】
下面关于乐音和噪声的叙述中,错误的是()A.
乐音悦耳动听，给人以享受；噪声使人烦燥不安，有害于健康
B.
乐音是乐器发出的声音；噪声是机器发出的声音
C.
乐音的振动遵循一定的规律；噪声的振动杂乱无章，无规律可循
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【单选题】The field research will take Joan and Paul about five months; it will be a long time ____ we meet them again.
A.
after
B.
before
C.
since
D.
when
【单选题】The field research will take Jone and Paul about five months; it will be a long time ____ we meet them again. [ ]
A.
after
B.
before
C.
since
D.
when
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