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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In the north of China, it has been snowing for weeks on___end, which causes severe damage to crops; it is estimated that the heavy snowfall will come to ____ end next week.
#8326
A
/; an
B
the; a
C
a; an
D
an; /
As is known to all ,Xi’an was starting point of world – famous Silk Road.
#9885
A
/; /
B
a; a
C
the; /
D
the; the
What _______ pity that you must leave now! It is such _______ great fun to have dinner with you．
#9015
A
a; a
B
a; the
C
/; a
D
a; /
Many Internet users make _____ most of the half-price promotion and it is _____ good opportunity for online shopkeepers to get their names known.
#8088
A
a; the
B
/; the
C
the; /
D
the; a
Thanks to _____ help from his teachers and classmates, he has made _______ rapid progress in his studies.
#8635
A
不填；a
B
the; 不填
C
the; a
D
a; the