单项选择题

A. 8 hours.
B. 7 hours.
C. 9 hours.
D. 10 hours.
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单项选择题
A. Growing tobacco. B. Using tobacco and selling to individuals under the age of 18. C. Individuals under the age of 18 buying tobacco. D. Using tobacco.
A. Growing tobacco.
B. Using tobacco and selling to individuals under the age of 18.
C. Individuals under the age of 18 buying tobacco.
D. Using tobacco.
单项选择题
A. To study how the birds decide the order of the flock.B. To study how the birds decide the route of the flock.C. To study how the birds decide the time of flying of the block.D. To study how the birds decide who takes charge of the flock.
A. To study how the birds decide the order of the flock.
B. To study how the birds decide the route of the flock.
C. To study how the birds decide the time of flying of the block.
D. To study how the birds decide who takes charge of the flock.
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