While he was investigating ways to improve the telescope, Newton made______ discover which completely changed______man’s understanding of colour.
#7612
A
a…不填
B
a…the
C
不填…the
D
the…a
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(2013·安徽名校联考Ⅱ)—You've dropped ________ “s” in the word “acros”．—Oh, ________ letter “s” should be doubled like this “across”．
#7942
A
a; a
B
an; a
C
an; the
D
the; the
Everything comes with ________ price；there is no such ________ thing as a free lunch in the world.
#7886
A
a；a
B
the；/
C
the；a
D
a；/
— Have you seen ____ pencil? I left it here this morning.—Is it _____black one? I think I saw it somewhere.
#8532
A
a; the
B
the; the
C
the; a
D
a; a
We need an effective strategy to help children living in ______ poverty to have the opportunity to receive ______ good education.
#8569
A
/ ; a
B
a ; /
C
/ ; the
D
the ; a
You know, ________ knowledge of ________computer is necessary to a secretary(秘书).
#9894
A
a; /
B
the; the
C
the; /
D
a; a