一般来说，信用等级最高的债券是()。
A.可转换债券
B.公司债券
C.政府债券
D.金融债券
参考答案：C
解析：政府债券是信用等级最高的债券。
Every year a lot of babies ________ born.[ ]
A. is
B. are
C. was
D. were
