下列物质中对骨髓造血干／祖细胞的增殖、分化起重要调控作用的是（） A.IL-2 B.

阅读理解。

     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!

1. _______ questions were asked about Daniel's unusual job.

A. One

B. Two

C. Three

D. Four

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

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

3. The underlined "Marine Science" and "Zoology" must be two _______ at university.

A. subjects

B. books

C. scientists

D. prizes

4. 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

票据发行便利是一种具有法律约束力的（）票据发行融资的承诺。

A.短期

B.中央银行

C.中期周转性

D.中长期扩张性

浅色啤酒酿造水的理想硬度应为（）。

A.2～8°dH

B.10～16°dH

C.1～2°dH

D.16～20°dH

哈尔滨用户（本地主叫0.40元/分钟）在本地通过正常方式拨打本地移动用户，通话三分钟，无其它优惠套餐时，如何收费？

YJ19A卷烟机采用（）嗽叭嘴、烟条切割平稳。

A.旋转式

B.往复式

C.固定式

D.上下运动式