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When did you last see a polar bear? On a trip to a zoo, perhaps? If you had attended a winter activity in New York a few years ago, you would have seen a whole polar bear club. These 'Polar Bears' are people who meet frequently in the winter to swim in freezing cold water. That day, the air temperature was 3℃, and the water temperature was a bit higher. The members of the Polar Bear Club at Coney Island, New York are usually about the age of 60. Members must satisfy two requirements. First, they must get along well with everyone else in the group, this is very important because there are so many different kinds of people in the club. Polar Bears must also agree to swim outdoors at least twice a month from November through February. Doctors do not agree about the medical effects of cold-water swimming. Some are worried about the ers of a condition in which the body's temperature drops so low that finally the heart stops. Other doctors, however, point out that there is more er of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter. The Polar Bears themselves are satisfied with the benefits (or advantages) of cold-water swimming. They say that their favorite form of exercise is very good for the circulatory system(循环系统) because it forces the blood to move fast to keep the body warm. Cold-water swimmers usually turn bright red after a few minutes in the water. A person who turns blue probably has a very poor circulatory system and should not try cold-water swimming. The main benefits(or advantages) of cold-water swimming are probably mental. The Polar Bears love to swim year-round; they find it fun and relaxing. As one 70-year-old woman says. 'When I go into the water, I pour my troubles into the ocean and let them float away.' 51. The members of the Polar Bear Club must meet the following requirements except that_____ . A. they should be easy to make friends with B. they must swim outdoors at least 8 times in the four cold months C. they must agree to swim outdoors from November through February D. they must reach the age of 60 52. Doctors _____ . A. encourage people to take part in cold-water swimming actively B. point out the possible er of blood illness during cold-water swimming C. believe swimming is helpful both in winter and in summer D. have different ideas about the medical effects of cold-water swimming 53. According to the passage, some doctors believe it is true that _____ . A. you are healthy if cold-water swimming turns your skin color blue B. cold-water swimming causes more heart attacks in summer than in winter C. cold-water swimming can make the body temperature erously high D. Polar Bears are bears swimming in freezing water 54. The Polar Bears like to swim all the year round, for _____ . A. they can remain young   B. it is an easy way to keep the body warm in winter C. they find it enjoyable and interesting D. they might meet fewer troubles in life 55. The passage is mainly about _____ . a group of cold-water swimming lovers                  B. the polar bears' life C. doctors' ideas about cold-water swimming            D. the requirements of the Polar Bear Club

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举一反三

【多选题】关于使用总账系统制单,下列描述中正确的有( )。

A.
可查看任意科目的最新余额
B.
可控制操作员使用科目的权限
C.
凭证可按任意格式的文本文件引入和引出
D.
不能修改和删除其他子系统生成的凭证

【单选题】新生儿循环系统描述错误的是

A.
新生儿出生最初几天心前区可闻及心脏杂音
B.
新生儿心率波动范围为100~160次/分
C.
新生儿血液多分布于躯干及内脏
D.
新生儿红、白细胞计数较高
E.
新生儿左右房之间的卵圆孔自出生后立即关闭

【单选题】胎儿循环系统的特点之一是

A.
有两条脐静脉
B.
脐静脉汇入肝脏
C.
脐动脉内为含氧量高的动脉血
D.
入右心的为含氧量低的静脉血
E.
右心的血有 1/3 通过肺脏

【单选题】属循环系统疾病问诊内容的是( )

A.
呼吸困难
B.
肌肉震颤
C.
腰痛
D.
呕吐
E.
腹泻

【单选题】关于节肢动物门的循环系统,下列说法正确的是()

A.
血液流速快
B.
闭管式循环
C.
心脏为薄囊状或长管状
D.
血液多为红色

【单选题】对循环系统不正确的叙述是

A.
主要功能是运送血液和淋巴
B.
是由一系列连续的密闭式管道和管道内液体所组成
C.
通过血液和淋巴循环而起到运输营养物质、氧气和机体内代谢产物等的作用
D.
心血管系和淋巴管系是两个互不相通的管道系统

【单选题】要求随时取得规定温度以上热水的建筑,对循环系统的设置要求是()。

A.
无需设置回水管道
B.
保证支管中的热水循环
C.
保证干管和立管的热水循环
D.
以上说法均不正确

【多选题】循环系统包括

A.
血液系统
B.
免疫系统
C.
淋巴系统
D.
呼吸系统

【单选题】循环系统问诊内容( )

A.
咳嗽、咳痰、咯血、胸痛、呼吸困难
B.
食欲不振、苍白、黄染、腹胀、便秘、腹泻
C.
呼吸困难、咳嗽、咳痰、咯血、心悸、水肿
D.
心悸、气短、水肿、头晕、头痛、苍白、黄染
E.
尿频、尿急、尿痛、尿量、尿颜色、腹痛、水肿

【多选题】电晕对系统的影响有()。

A.
损耗电功率
B.
改变线路参数
C.
对通讯有相当大的影响
D.
没有影响

【单选题】下列哪组动物代表了脊椎动物循环系统从简单向复杂的演化()

A.
鲤鱼→青蛙→乌龟→青燕子
B.
蟾蜍→鳜→蛇→鳄
C.
海龟→大鲵→狗→鲨鱼
D.
大雁→家兔→蛇→蝾螈

【单选题】以下动物具有闭管式循环系统的是( )

A.
蚯蚓和乌贼
B.
蚯蚓和蚂蟥
C.
蚂蟥和蜈蚣
D.
蜘蛛和章鱼
相关题目:
【多选题】关于使用总账系统制单,下列描述中正确的有( )。
A.
可查看任意科目的最新余额
B.
可控制操作员使用科目的权限
C.
凭证可按任意格式的文本文件引入和引出
D.
不能修改和删除其他子系统生成的凭证
【单选题】新生儿循环系统描述错误的是
A.
新生儿出生最初几天心前区可闻及心脏杂音
B.
新生儿心率波动范围为100~160次/分
C.
新生儿血液多分布于躯干及内脏
D.
新生儿红、白细胞计数较高
E.
新生儿左右房之间的卵圆孔自出生后立即关闭
【单选题】胎儿循环系统的特点之一是
A.
有两条脐静脉
B.
脐静脉汇入肝脏
C.
脐动脉内为含氧量高的动脉血
D.
入右心的为含氧量低的静脉血
E.
右心的血有 1/3 通过肺脏
【单选题】属循环系统疾病问诊内容的是( )
A.
呼吸困难
B.
肌肉震颤
C.
腰痛
D.
呕吐
E.
腹泻
【单选题】关于节肢动物门的循环系统,下列说法正确的是()
A.
血液流速快
B.
闭管式循环
C.
心脏为薄囊状或长管状
D.
血液多为红色
【单选题】对循环系统不正确的叙述是
A.
主要功能是运送血液和淋巴
B.
是由一系列连续的密闭式管道和管道内液体所组成
C.
通过血液和淋巴循环而起到运输营养物质、氧气和机体内代谢产物等的作用
D.
心血管系和淋巴管系是两个互不相通的管道系统
【单选题】要求随时取得规定温度以上热水的建筑,对循环系统的设置要求是()。
A.
无需设置回水管道
B.
保证支管中的热水循环
C.
保证干管和立管的热水循环
D.
以上说法均不正确
【多选题】循环系统包括
A.
血液系统
B.
免疫系统
C.
淋巴系统
D.
呼吸系统
【单选题】循环系统问诊内容( )
A.
咳嗽、咳痰、咯血、胸痛、呼吸困难
B.
食欲不振、苍白、黄染、腹胀、便秘、腹泻
C.
呼吸困难、咳嗽、咳痰、咯血、心悸、水肿
D.
心悸、气短、水肿、头晕、头痛、苍白、黄染
E.
尿频、尿急、尿痛、尿量、尿颜色、腹痛、水肿
【多选题】电晕对系统的影响有()。
A.
损耗电功率
B.
改变线路参数
C.
对通讯有相当大的影响
D.
没有影响
【单选题】下列哪组动物代表了脊椎动物循环系统从简单向复杂的演化()
A.
鲤鱼→青蛙→乌龟→青燕子
B.
蟾蜍→鳜→蛇→鳄
C.
海龟→大鲵→狗→鲨鱼
D.
大雁→家兔→蛇→蝾螈
【单选题】以下动物具有闭管式循环系统的是( )
A.
蚯蚓和乌贼
B.
蚯蚓和蚂蟥
C.
蚂蟥和蜈蚣
D.
蜘蛛和章鱼