____________,it was concluded that sound was produced by vibration.(test)
经过调查和测试得出声音是由振动产生的结论。
第2题
Tha bag ______ books ______ mine.
A.full of; are
B.full of; is
C.full in; are
第5题
Some states have an income tax similar to ______ of the federal government。
A. tha。
B. those
C. this
D. these
第6题
A.When
B.While
C.Unless
D.Until
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