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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What I need is _____ book that contains _____ ABC of oil painting.
#10408
A
a；不填
B
the; 不填
C
the; an
D
a; the
____new wave of Chinese migration is under way, fuelled by ever-younger students for whomEnglish is not a piece of knowledge but a living language to unlock ____ door of the wider world.
#8465
A
The; the
B
The; a
C
A; the
D
A; a
The cakes are delicious. I’d like to have _______ third one as ________ second one I ate was too small.
#9424
A
the; the
B
a; the
C
the; a
D
a; a