首页
登录
职称英语
Imagine an animal that becomes frozen in cold weather. Then, when it gets wa
Imagine an animal that becomes frozen in cold weather. Then, when it gets wa
游客
2024-01-22
8
管理
问题
Imagine an animal that becomes frozen in cold weather. Then, when it gets warmer, the animal simply unfreezes and goes back to its normal life. Although this may sound like something from a science-fiction movie, it is exactly what happens to the wood frog over winter and spring. When winter begins, the frog, which is found throughout much of Canada, buries itself in leaves and dirt. As the ground begins to freeze, so does the frog’ s body.
Normally, if a living creature is frozen, the cells inside its body are destroyed, leading to death. How, then, does the wood frog survive? The secret lies in the fact that although the water between the cells in the frog’ s body becomes frozen, the water inside the cells does not freeze. Before the winter begins, the frog stores starch in its body. As the weather gets colder, the drop in temperature causes the frog’ s body to change this starch into glucose. This glucose, in turn, lowers the temperature at which the liquid inside the frog’s cells freezes. As a result, the cells do not freeze even at very low temperatures, allowing the frog to stay alive. Some wood frogs stay in this frozen state— with their hearts stopped completely—for months without harm.
Now researchers are hoping to adapt the wood frog’ s secret to help them preserve human organs for transplants. Currently, after organs are removed from a donor’ s body, they are packed in a special liquid and kept very cold. However, they cannot be frozen because the ice would damage the cells in the organs. For this reason, the organs must be used quickly. If doctors had a way to preserve organs longer, they would have more time to find the best matches among people waiting for organ transplants.
There is still a lot about the wood frog that scientists do not understand. They still have to work out, for example, exactly how the frog is able to unfreeze itself and what actually restarts the frog’s heart when the weather becomes warmer. What is clear, however, is that lessons learned by studying this tiny creature could be of great benefit to humans in the near future. [br] The wood frog is unusual because it______.
选项
A、can move about easily on frozen ground
B、buries itself in leaves and dirt at the start of spring
C、survives even after its body has become frozen
D、lives a normal life even in very cold weather
答案
C
解析
细节题。根据短文开头内容…frozen in cold weather…unfreezes and goesback to its normal life.以及this may sound…science—fiction movie…wood frog可知wood frog的不寻常之处在于即使它全身都结冰了,它也可以复活。故选C。
转载请注明原文地址:https://tihaiku.com/zcyy/3384853.html
相关试题推荐
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
[originaltext](1)Whenadoglosesaleg,theanimaleventuallyfiguresout
Researchershaveidentified1.4millionanimalspeciessofar—andmillionsre
Researchershaveidentified1.4millionanimalspeciessofar—andmillionsre
Researchershaveidentified1.4millionanimalspeciessofar—andmillionsre
Researchershaveidentified1.4millionanimalspeciessofar—andmillionsre
随机试题
______hedisagreedwiththeidea,hewaswillingtogoalongwiththemajority.
穿过森林的那条路远比原野上的那条路舒服得多。 Thepaththroughtheforestisbyfarmorepleasantth
在公共场所举办营业性演出,演出场所经营单位应当依照有关安全、消防的法律、行政法规
国有金融企业增资扩股,存在以下( )情形的,可以采取非公开协议方式进行增资。A
在“中国古代诗歌格律研习”教学活动中,教师提醒学生注意区分古体诗与近体诗,理解近
国债收益率曲线是反应()的有效途径。A.远期利率 B.资产 C.负债
A.杏苏散 B.麻杏石甘汤 C.桑杏汤 D.止嗽散 E.清金化痰汤风寒咳
信用保险合同的政治风险责任不包括()。A:政府有关部门征用或没收 B:买方政府
生长发育最为迅速的一期是A:围生期 B:婴儿期 C:幼儿期 D:学龄前期
患儿,男,3岁。因化脓性脑膜炎入院,脓液细菌培养显示为脑膜炎双球菌感染。进行抗菌
最新回复
(
0
)