()是著作权主体。
A.报告文学作者
B.电影导演
C.官方译本的译者
D.艺术品收藏者
参考答案:A, B, D
Years ago we didn't know this, but recent science ______ that people who don't sleep well soon get ill.
A.showed
B.has shown
C.will show
D.is showing
新生儿溶血病是如何发生的?