《中国文献编目规则》是在（）著录原则的基础上制定的著录法。

Today I’d like to talk about how to become a (1) . Usually you have to start at the beginning. That is, you have to begin (2) of some sort on a local newspaper, a (3) , maybe on a small magazine -- work (4) . Now there aren’t that many organizations which have large numbers of foreign correspondents so you also have to (5) with that aim (6) . Another way of doing it is to work abroad, and work as (7) . That’s somebody who sells stories, and gets paid (8) , to newspapers and magazines and so on. And hoping to (9) that way, and eventually to be offered a (10) .
I don’t really know (11) are needed, but obviously a degree in modern languages or (12) would be very useful. But, a degree in itself probably wouldn’t (13) . It wouldn’t be enough to get you job. It wouldn’t (14) to make an editor decide to (15) . So it’s difficult to define the (16) . You’re going to need (17) and the ability to assimilate information (18) and then produce stories which (19) of the newspaper or radio or television station you (20) .

根据短文内容及首字母提示，完成文中所缺单词。

English is difficult to learn because it is so d___41____ from our mother tongue(母语). On the other hand, we haven’t got enough chance to s____42____ English to foreigners.

So the first important thing for us to do, I think, is to p__43____ speaking English more both in and out of class. In class, I l____44___ to the teacher very carefully and try my b___45____ to answer the teacher’s questions. After class, I listen to the tape of the texts again and again until I can u____46____ every word of it. I often retell(复述) the text in my own words. I always work h___47___ at English and never give it up.

Of course, this is not e___48____. In the evening I do my homework very c___49____. When I find something interesting, I write it d____50_____in English. At first, I couldn’t write well, but with the help of my teacher I have made great progress.

41__________42__________43__________44_________45__________

46__________47__________48_________49_________50__________

如图，在双缝干涉实验中，已知SS₁=SS₂，且S₁、S₂到光屏上P点的路程差△s=1.5×10^-6 m，当S为λ=0.6μm的单色光源时，在P点处将形成_______条纹；当S为λ=0.5μm的单色光源时，在P点处将形成_______条纹。（填“明”或“暗”）

试述心力衰竭患儿的护理措施。

2000版ISO 9000族标准( )在ISO 9001标准的基础上增加行业特殊要求的条款。

A．不允许

B．允许

C．要求

D．已经