首页
登录
职称英语
We know that oxygen is necessary for the breathing of animals and plants and
We know that oxygen is necessary for the breathing of animals and plants and
游客
2023-10-05
50
管理
问题
We know that oxygen is necessary for the breathing of animals and plants and for burning. Only one-fifth of air holds oxygen, but this is quite enough for all ordinary uses. Pure oxygen is used for special kinds of breathing and burning, for instance, patients in hospital and research workers working in high mountainous district.
High up about the earth air is not so plentiful. On the top of a mountain our lungs would not take in as much oxygen at each breath as they would at the bottom, and on very high mountains, breathing is so difficult that men have little strength.
Air has enough oxygen for the burning of a fire. Pure oxygen would cause the wood or coal to burn so fast that it would be wasted. When a very hot fire is needed for a special purpose, oxygen is supplied instead of air.
选项
A、Plants
B、Animals
C、Human beings
D、A, B and C
答案
D
解析
此题题干问“没有了氧气什么不能存活”。在原文第1段第1句话可以得出动物和植物的呼吸都需要氧气,人也是高级动物,因此呼吸都需要氧气。因此选项D.A,B and C是正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3073399.html
相关试题推荐
Afterabusydayofworkandplay,thebodyneedstorest.Sleepisnecessary
Thispassageismainlyabout______.[br]Electronicanimalsareverypopularin
Thispassageismainlyabout______.[br]Electronicanimalsareverypopularin
AlthoughtheArcticlookslifeless,thereareanimalsmovingabout.Caribou
AlthoughtheArcticlookslifeless,thereareanimalsmovingabout.Caribou
AlthoughtheArcticlookslifeless,thereareanimalsmovingabout.Caribou
AlthoughtheArcticlookslifeless,thereareanimalsmovingabout.Caribou
AlthoughtheArcticlookslifeless,thereareanimalsmovingabout.Caribou
AlthoughtheArcticlookslifeless,thereareanimalsmovingabout.Caribou
AlthoughtheArcticlookslifeless,thereareanimalsmovingabout.Caribou
随机试题
Scientistsinthe1950sproclaimedtherobotthebrainwave(灵感,灵机)ofthefu
I’mafraidyou’vebeen______.Thisbanknoteisaforgery(伪造物).A、takeninB、tak
Startinginthemid-1990s,majorAmericancitiesbeganaradicaltransforma
"Blink"TechnologyA)Tiredofallthattime-consumingsw
MyfatherdiedwhenIwasnine.I’manonlychild.MymotherandIwere
抗拉性能是钢材的最主要性能,表征其性能的技术指标主要是( )。 A.屈服强度
下列属于测绘标准分类的是()A:定义与描述类B:获取与处理类C:检验和测试类
在电缆通道、夹层内动火作业应办理动火工作票,并采取可靠的()措施。(A)防小
2014年一季度世界粗钢总产量是多少万吨?() A.20270 B.35
下列关于Vega说法正确的有()。?A.Vega用来度量期权价格对波动率的敏感
最新回复
(
0
)