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.
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单项选择题
A. It suggests the polarization of the allotment of the social resources on the plane.B. More and more space and amenities are given to first-class passengers.C. Less space and fewer amenities are provided to coach passengers.D. The society is getting more and more balanced in wealth distribution.
A. It suggests the polarization of the allotment of the social resources on the plane.
B. More and more space and amenities are given to first-class passengers.
C. Less space and fewer amenities are provided to coach passengers.
D. The society is getting more and more balanced in wealth distribution.
单项选择题
A. That the participants are growing makes L.Ａ, Bike Trains unique. B. That the length of the route ranges from 7 to 32kin makes L.Ａ. Bike Trains unique. C. The profound meaning makes L.Ａ. Bike Trains unique. D. Its early launch time makes L.Ａ. Bike Trains unique.
A. That the participants are growing makes L.Ａ, Bike Trains unique.
B. That the length of the route ranges from 7 to 32kin makes L.Ａ. Bike Trains unique.
C. The profound meaning makes L.Ａ. Bike Trains unique.
D. Its early launch time makes L.Ａ. Bike Trains unique.
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