We can never expect ________ bluer sky unless we create ________ less polluted world.(2009·安徽)
#7922
A
a；a
B
a；the
C
the；a
D
the；the
推荐题目
------- we are going there by _____ sea.------ Don’t you think it too slow? Why not take ______train?
#9290
A
the; /
B
the; the
C
/; /
D
/; the
—Do you know Tom came _____ third in the marathon held yesterday? —Yeah！And it was _____ 18-hour bicycle marathon.
#9649
A
不填; the
B
the; 不填
C
不填; an
D
the; a
Do you know that Yuan Longping is known as ______ father of hybrid rice (杂交水稻)?
#8654
A
/
B
the
C
a
D
an