紫外光区的波长范围为()。
A、10-1~0nm
B、10~380nm
C、380~780nm
D、0.78~5.0μm
参考答案:B
Every year _____ money and energy is spent on environment protection.
A.large quantities of
B.a large number of
C.a large quantity of
D.a plenty of
好莱坞出产的影片曾包含大量的吸烟内容。