某地防疫站1985年疫情资料统计共发生狂犬病60例,且全部死亡,根据此资料
A. 可以计算狂犬病死亡率
B. 可以计算狂犬病死亡专率
C. 可以计算狂犬病病死率
D. 可以计算狂犬病标化死亡率
E. 资料不全,不能计算率
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—What are you doing —I'm ______ the piano.
A. [A] exercising
B. [B] practising
C. [C] training
I liked the trip ______ I found it to be a wonderful experience.
A. [A] though
B. [B] which
C. [C] because
The new students asked ______ the school had a good library.
A. [A] when
B. [B] whether
C. [C] where
I can't do the exercise because I've ______ my book at home.
A. [A] forgotten
B. [B] left
C. [C] taken