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
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If you want to make _____ life for yourself, you have to be prepared to face _____ great many unexpected difficulties.
#8479
A
/ ; a
B
/ ; the
C
a ; the
D
a ; a
We were caught in________ heavy rain but afterwards we enjoyed_________ bluer and cleaner sky.
#8624
A
a, the
B
不填; the
C
a, a
D
不填; the
Life of Pi is about an Indian boy who finds himself drifting in ________ Pacific Ocean with _______ Bengal tiger after ________ shipwreck.
#8269
A
the, a, a
B
/, a, the
C
the, a, the
D
/, the, a
Shenzhou VII，______ country’s third manned spaceship, was launched successfully on September 25, 2008 in ______northwestern Gansu Province，China．
#10171
A
a；不填
B
the；the
C
the；不填
D
a；the