在正常工作条件下，电击防护中利用遮栏和外护物的完全防护，要求人能触及到的各种电压等级

Sharks frighten most of us, but Daniel Weaver, a shark scientist, swims with them for a living! We asked him some questions about this unusual job.

So Daniel, what’s it like to be a shark scientist?

Well, it’s a great job. I often travel to faraway places like South Africa and Fiji to study sharks. On the other hand, a shark scientist sometimes does boring desk work, such as writing reports. Also, shark scientists don’t usually get paid a lot.

What qualities (品质) do you need to become a shark scientist?

Shark scientists need to be wise and strong. They enjoy working outdoors and they have to be cool and patient (耐心). They also have to be quite brave!

So do you think it’s a dangerous job?

Well, sharks have up to 15 rows of sharp teeth. However, sharks hardly attack (攻击) humans. There are over 350 kinds of sharks in the world and only about 10 are dangerous to us. In fact, dogs kill more people every year than sharks! Humans kill over 12 million sharks a year for food and sport!

How do you become a shark scientist?

A shark scientist usually studies Marine Science or Zoology at university. It’s also good to get some work experience in an aquarium (水族馆). In my opinion, I have the best job in the world!

小题1:_______ questions were asked about Daniel’s unusual job.

A．One

B．Two

C．Three

D．Four小题2:As a shark scientist, Daniel _______.

A．studies sharks in his neighbourhood

B．makes lots of money

C．swims with sharks for a living

D．only writes reports on sharks小题3:In Daniel’s opinion, one needs to be _______ to become a shark scientist.

①excited   ②patient      ③brave    ④strong   ⑤wise

A．①②③④

B．①③④⑤

C．②③④⑤

D．①②④⑤小题4:The underlined “Marine Science” and “Zoology” must be two _______ at university.

A．subjects

B．books

C．scientists

D．prizes小题5:From the passage we can know that _______.

A．sharks are likely to attack humans

B．dogs are as dangerous as sharks to humans

C．sharks are not dangerous to humans at all

D．humans do more harm to sharks than sharks do to humans

比一比，排一排，从大到小排列

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如图所示,AB为竖直转轴,细绳AC和BC的结点C系一质量为m的小球,两绳能承担的最大拉力均为2mg,当AC和BC均拉直时∠ABC=90°,∠ACB=53°,ABC能绕竖直轴AB匀速转动,因而C球在水平面内做匀速圆周运动,求:

(1)当m的线速度增大时,AC和BC(BC="1" m)哪条绳先断?

(2)一条绳被拉断后,m的速率继续增加,整个运动状态会发生什么变化?

在社会调查中发现，人群中夫妇双方表现型正常也可能生出患某种遗传病的女孩。遗传学的研究表明，该遗传病是由一对等位基因控制的。请分析下面的叙述，其中符合该种遗传病传递方式的是（）

A.该遗传病可能受位于X染色体上的隐性基因控制

B.该遗传病患者与表现型正常的人结婚，子代患病的概率女孩大于男孩

C.如果夫妇一方是该遗传病患者，他们所生子女一定是携带者

D.如果夫妇双方都是携带者，他们生出患病孩子的概率是1／4

表寒证的脉象是（）

A.浮数

B.浮紧

C.浮细

D.浮缓

E.浮滑