The American movies are popular because______.
A.they are well-made and the stories are interesting
B.the characters in the movies are free to do whatever they like
C.the heroes have to cope with many problems and frustrations
D.good guys in the movies always win in the end
第6题
A.A.强度硬度下降,塑性韧性提高
B.B.强度硬度提高,塑性韧性下降
C.C.强度韧性提高,塑性韧性下降
D.D.强度韧性下降,塑性硬度提高
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