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
During _________ 3-day conference, global warming became _________ major concern of all the representatives.
#9505
A
the; a
B
a; the
C
the; \
D
a; \
It was ________ very rare find and the archaeologist who made ________ discovery said it was like unearthly a Mona Lisa.
#7810
A
a; the
B
the; the
C
the; a
D
a; a
I can’t remember when ______ turning point occurred exactly, but it might be ______summer morning when I was in New York.
#8271
A
不填；a
B
a; a
C
the; a
D
a; the
— Guess what? Tom has failed in the exam _______ second time.— How come? He is ______ second to none in English in our class.
#9204
A
a; a
B
the; a
C
a; /
D
the; the
My friend Monica, student in class 12, made great progress in the mid-term examination.
#8944
A
a, the
B
a, a
C
the,/
D
a,/