问题 选择题

哪些系统参与了你的运动(  )

①消化系统②呼吸系统③运动系统④神经系统.

A.①②③④

B.①③④

C.②③④

D.①②③

答案

运动系统的功能:运动、支持、保护.在运动中,神经系统起调节作用,骨起杠杆的作用,关节起支点作用(也有说枢纽作用),骨骼肌起动力作用.可见,人体完成一个运动都要有神经系统的调节,有骨、骨骼肌、关节的共同参与,多组肌肉的协调作用,才能完成.运动并不是仅靠运动系统来完成.它需要神经系统的控制和调节.它需要能量的供应,当我们进行剧烈运动的时候,不但全身骨胳肌的活动加强了,呼吸也加深加快,可以吸入更多的氧,呼出更多的二氧化碳;同时,心跳也随着加强加快,促进血液更快地循环,输送给骨胳更多的养料和氧,运走更多的废物.人体各个器官、系统的协调活动,充分体现出人体是一个统一的整体,因此运动还需要消化系统、呼吸系统、循环系统等系统的配合.哺乳动物的运动能力发达,利于捕食和避敌,以适应复杂多变的环境.

故选:A

阅读理解

Special Bridges Help Animals Cross the Road

----- Reported by Sheila Carrick

Why did the chicken cross the road? To get to the other side. Most people know this joke. But recently, some people have been much more concerned with how the grizzly bear and mountain lion can cross the road. Millions of animals die each year on U.S. roads, the Federal Highway Administration reports. In fact, only about 80 ocelots, an endangered wild cat, exist in the U.S. today. The main reason? Road kill. "Ecopassages" may help animals cross the road without being hit by cars. They are paths both over and under roads. "These ecopassages can be extremely useful, so that wildlife can avoid human conflicts, " said Jodi Hilty of the Wildlife Conservation Society. But do animals actually use the ecopassages?The answer is yes. Paul Beier of Northern Arizona University found foot marks left by mountain lions on an ecopassage that went under a highway. This showed that the lion used the passage. Builders of some ecopassages try to make them look like a natural part of an area by planting trees on and around them. Animals seem to be catching on. Animals as different as salamanders and grizzly bears are using the bridges and underpasses. The next time you visit a park or drive through an area with a lot of wildlife, look around. You might see an animal overpass!

小题1:The writer uses the example of “ocelots” to show that_________.

A.wild animals have become more dangerous

B.the driving conditions have improved greatly

C.the measure for protecting wildlife fails to work

D.an increasing number of animals are killed in road accidents小题2:When the writer says that animals seem “to be catching on”, he means_________.

A.animals begin to realize the dangers on the road

B.animals begin to learn to use ecopassages

C.animals are crossing the road in groups

D.animals are increasing in number小题3:The writer asks visitors and drivers to look around when traveling because_________.

A.wild animals may attack cars

B.wild animals may jam the road

C.they may see wild animals in the park

D.they may see wild animals on ecopassages

多项选择题