A. the; a
B. the; 不填
C.不填; 不填
D.不填; a
[单选题]In 1847 most countries of the world were ______.A. not yet using postage stampsB. collecting valuable stampsC. buying stamps from NeuritisD. printing their own stamps
[单选题]______is known to all, Peking University is one of the most famous universi
[单选题]______is known to all, Peking University is one of the most famous universi
[单选题]It is well-knownthat life expectancy is longer in Japan than in most other
[单选题]It is well-knownthat life expectancy is longer in Japan than in most other
[单选题]It is well-knownthat life expectancy is longer in Japan than in most other
[单选题]It is well-knownthat life expectancy is longer in Japan than in most other
[单选题]It is well-knownthat life expectancy is longer in Japan than in most other
[单选题]It is well-knownthat life expectancy is longer in Japan than in most other
[单选题]It is well-knownthat life expectancy is longer in Japan than in most other