Shooting, as __________ means of survival originally, developed into _________ sport only in the late 19th century.
#8899
A
a; a
B
the; the
C
a; the
D
the; a
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It rains very heavily in this area, which has _______ annual rainfall of 7,000 mm, _______ideal environment for forests.
#9602
A
the; an
B
an; 不填
C
an; an
D
不填; the
________ material used for running tracks in schools across China may be ________ danger to children's health.
#7879
A
/；a
B
The；a
C
/；the
D
The；the
The development of industry has been ________ gradual process throughout ______ human existence from stone tools to modern technology.
#9114
A
不填；the
B
the; a
C
a; 不填
D
a; a
Not only spring but autumn is ______ good time for Wenzhounese to experience ______ nature, especially when sweet osmanthus (桂树) in full blossom.
#9660
A
/, the
B
a, the
C
the, /
D
a, /