【单选题】______ birds use their feathers for flight, some of their feathers are for other purposes.
【单选题】____birds use their feathers for flight, some of their feathers are for others purposes.
【单选题】在等比数列 中, ,公比q=2 , 则 ( ) , ( )
【单选题】According to the author, which is the most feasible way to protect birds?
A.
Use fences to protect all the parks in the world.
B.
Try to protect wild space and nature.
C.
Abandon the economic values that birds can bring.
D.
Rely less on agriculture and return farmlands to forests.
【单选题】What do the fishermen do to encourage the birds?
A.
They use a long string to beat the birds.
B.
They give the birds some fish to encourage the birds.
C.
They beat the sides of the boat to stimulate the birds.
D.
They grasp several birds in one hand.