The word "flies" in the second sentence of the second paragraph means______.
A. flights
B. carriages
C. journeys
D. butterflies
______was proclaimed Canada's national anthem on July 1, 1980.
A. "God Save the Queen"
B. "The Star-Spangled Banner"
C. "O Canada"
D. "March of the Volunteers"
设置制单控制是在( )中进行的。
A. 凭证页签
B. 账簿页签
C. 会计日历
D. 其他
继发性视网膜脱离的常见病因为:①视网膜炎;②脉络膜炎;③眼内肿瘤;④机化物牵拉
A. ①②③
B. ①③
C. ②④
D. ④
E. ①②③④