While other scientists are keeping____eye on changes in the H5N1 bird flu strain, the scientists in England are working on vaccines, in case it becomes highly infectious in ____humans.
#9824
A
a , /
B
an, /
C
the, an
D
an, the
推荐题目
The students do their homework ____.
#10345
A
the most of the night
B
in most of the night
C
most of the night
D
in the most of the night
Online shopping is becoming _______ rising industry for China, as the country is ______ home to the world's largest online population．
#8083
A
不填;the
B
a; the
C
the;不填
D
a; 不填
If we sit near ______ front of the bus，we will have ________ better view．
#7726
A
不填；the
B
不填；a
C
the；a
D
the； the
Each member of ____ Green Pace Club is required to gain ____ better understanding of their system.
#9155
A
a; /
B
the, a
C
the, the
D
a, a