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问题 选择题

节肢动物就是身体由很多体节构成，体表有外骨骼、足和触角分节的无脊椎动物，下列哪组是节肢动物[ ]

A．蝗虫、蚂蝗　

B．蜈蚣、蜘蛛蟹　

C．杨子鳄、壁虎　

D．蝙蝠、海蜇

答案

答案：B

综合

读“世界主要工、农业地域类型分布示意图”回答：（15分）

(1)写出农业区中数字代表的世界农业地域类型:

①                    ②                  ③                     

④                      

⑵③代表的农业地域类型,其代表性的国家是          ,该国这种农业地域类型主要分布在__________,其有利区位条件有_________________________________________________

_______________________________________________________________________________

⑶ ④地区是一种________  密集型农业，这里的气候特点是_______
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单项选择题

Both bus and tree topologies are characterized by the use of multipoint (16) ．For the bus，all stations attach，through appropriate hardware (17) known as a tap，directly to a linear transmission medium，or bus．Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the (18) ．A transmission from any station propagates the length of the medium in both directions and can be received by all other (19) ．At each end of the bus is a (20) ，which absorbs any signal，removing it from the bus．

A．medium

B．connection

C．token

D．resource
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