金属燃烧属于＿。
A.扩散燃烧
B.蒸发燃烧
C.分解燃烧
D.表面燃烧
参考答案：D
Kate's never late for school, ______?[ ]
A. isn't she
B. hasn' the
C. is she
D. has she
People are _________the use of alternative energy sources. Because the fossil fuels _________will be used sooner or later.
A．pushing for/ consumed
B．struggling for /being consumed
C．pushing for/ being consumed
D．preferring /being used
