已知椭圆x2a2+y2b2=1过定点A（1，0），且焦点在x轴上，椭圆与曲线|y

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) .

胶体铅酸电池与车用铅酸电池有何不同点？

左向右分流型先天性心脏病患儿生长发育落后是由于（）

A.肺动脉高压

B.肺循环血量增加

C.肺循环血量减少

D.体循环血量增加

E.体循环血量减少

心包压塞的主要表现有哪些（）

A.尿少

B.心音遥远

C.脉压差小

D.奇脉

E.血压升高

After the break, the lecturer went on to talk ______ about the new academic concept. [ ]

A. at length      

B. in all        

C. in turn    

D. at most