5.第一个真正认识到它的性能并引用纳米概念的是( )科学家
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6.80年代中期,人们就正式把这类材料命名为( )。
7.理论上讲:可以使微电机和检测技术达到( )级。
Which of the following is 最佳影片奖 awarded by the Oscars?
A. Best Picture
Best Movie
C. Best Documentary
D. Best Feature
In the US movie rating system, a ______ movie is a movie appropriate for all ages.
A. G
B. PG
C. PG-13
D. R