Exploring ________ space is exciting, yet dangerous. There is _______need for both robots and humans for space exploration.
#8457
A
the; a
B
a; the
C
/; a
D
/; /
推荐题目
Maybe you are in ___ trouble, but don’t lose _____ heart in face of difficulty.
#8640
A
/; /
B
the; /
C
the; the
D
/; the
In most countries, a university degree can give you flying start in life.
#8801
A
the; a
B
the; 不填
C
不填; 不填
D
不填; a
Helen looked at ______ finished report with ______ satisfaction.
#7964
A
the; a
B
/; the
C
the; /
D
a ; the
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