受水平气压梯度力和地转偏向力等因素影响,近地面形成了风带和无风带(无盛行风地带)

题型:选择题

问题:

受水平气压梯度力和地转偏向力等因素影响,近地面形成了风带和无风带(无盛行风地带)。全球无风带的分布范围是[ ]

A.南北纬30°附近

B.南北纬40°附近

C.南北纬60°附近

D.南北纬80°附近

考点:全球的气压带风带及其季节性位移
题型:选择题

北京市政府规定,没有北京市户籍且在北京市交纳社会保障金不满一定年限的外来人口,不得在北京市购买居住性质的商品房,这项政策属于()。

A.调节性政策

B.自我调节性政策

C.分配性政策

D.再分配性政策

题型:选择题

社会的调查研究的最基本的对象有个人,初级社会群体,(织)。阶级和阶层,民族,社区,社会行为()等。

题型:选择题

Michael Fish may soon be replaced as a weather forecaster by something truly fishier---the shark(鲨鱼).

Research by a British biology student suggests that sharks could be used to predict storms.

Lauren Smith, 24, is close to completing her study on shark’s ability to sense pressure.

If her studies prove the theory, scientists may be able to monitor the behaviour of sharks to predict bad weather.

Miss Smith had previously studied the behaviour of lemon sharks in the Bahamas.

She then used their close relatives, lesser spotted dogfish, for further research at Aberdeen University.

Her work---thought to be the first of its kind to test the pressure theory ---- resulted from the observation that juvenile blacktip sharks off Florida moved into deeper water ahead of a violent storm in 2001.

Miss Smith said: “I’ve always been crazy about traveling and diving and this led me to an interest in sharks.”

“I was delighted to have been able to research in the area for my degree. I know there’s so much more we need to understand ---- but it certainly opens the way to more research.”

It has been discovered that a shark senses pressure using hair cells in its balance system.

At the Bimini Shark Lab in the Bahamas, Miss Smith fixed hi-tech sensors to sharks to record pressure and temperature, while also tracking them using GPS (Global Positioning System) technology.

In Aberdeen, she was able to study the effects of tidal(潮汐的) and temperature changes on dogfish----none of which were harmed. She also used a special lab which can mimic(模拟) oceanic pressure changes caused by weather fronts.

She is due to complete her study and graduate later this year. She says she will be looking for a job which will give her the chance to enrich her experience of shark research.

小题1:The passage is most probably taken from _____.

A.a short-story collection

B.a popular science magazine

C.a research paper

D.a personal diary小题2:What do we learn from the first four paragraph of the passage?

A.Sharks may be used to predict bad weather.

B.Sharks’ behaviour can be controlled.

C.Michael Fish is not qualified for his job.

D.Lauren Smith will become a weather forecaster.小题3:Lauren Smith conducted her research by _______.

A.removing hair cells from a shark’s balance system

B.measuring the air pressure of weather fronts

C.recording sharks’ body temperature

D.monitoring sharks’ reaction to weather changes小题4:What is the passage mainly about?

A.A popular way of forecasting weather.

B.A new research effort in predicting storms.

C.Biologists’ interest in the secrets of sharks.

D.Lauren Smith’s devotion to scientific research.

题型:选择题

下列关于局麻药的叙述错误的是

A.局麻作用是可逆的

B..阻滞细胞膜的Na+通道

C.可使动作电位幅度降低,传导减慢

D.只能抑制感觉神经纤维

E.敏感性与神经纤维的直径(粗细)成反比

题型:选择题

选用涂料时必须与干燥方法相结合。( )

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