In 1948, three American scientists invented ____ transistor, which is ____ small electronic device to control an electric current.
#8790
A
the; a
B
a; a
C
the; the
D
a; the
推荐题目
What ______ public is concerned about is whether medical workers and scientists will be able to find_____cure for this new disease in a short time.
#10418
A
不填;不填
B
不填;the
C
the;不填
D
the;a
Of the two brothers, Bill is ___ younger one, and he is ____ quiet boy, one that most adults like very much.
#8267
A
the; a
B
a ; the
C
a; one
D
the ; the
In order to find ______ better job, she planned to learn ______ second foreign language.
#8328
A
the；a
B
a；a
C
the；the
D
a；/
As ______ unemployment is very high at the moment, it’s very difficult for people to find______work.
#9080
A
the；/
B
/； /
C
the； a
D
an； the
It is quite apparent that the aging population in China will cause _____ heavy pressure on ____ whole society in the future .
#9868
A
a, /
B
/ ;/
C
a ; the
D
/ ; the