Chen jianmin,___director of the Chinese Earthquake Research Center,told the media that _____ early warning system for quakes was yet to be built in China不填;an

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Chen jianmin,___director of the Chinese Earthquake Research Center,told the media that _____ early warning system for quakes was yet to be built in China不填;an

Chen jianmin,___director of the Chinese Earthquake Research Center,told the media that _____ early warning system for quakes was yet to be built in China不填;an
Chen jianmin,___director of the Chinese Earthquake Research Center,told the media that _____ early warning system for quakes was yet to be built in China
不填;an

Chen jianmin,___director of the Chinese Earthquake Research Center,told the media that _____ early warning system for quakes was yet to be built in China不填;an
个人觉得第一个空加个a好点吧,director of the Chinese Earthquake Research Center这不是一句完整的话,只是用来修饰Chen jianmin 起说明作用的成份,这个结构也就是一个同位语结构,如果说不加a的话,那么这里的director就是一个官衔或者职位,这种情况就不加a.
附冠词的用法:不定冠词a/an(an用在后面的词是以元音开头的词前面),定冠词the
1) 国名,人名前通常不用定冠词:England,Mary;
2)泛指的复数名词,表示一类人或事物时,可不用定冠词;
They are teachers.他们是教师.
3)抽象名词表示一般概念时,通常不加冠词;
Failure is the mother of success.失败乃成功之母.
4)物质名词表示一般概念时,通常不加冠词,当表示特定的意思时,需要加定冠词;
Man cannot live without water.人离开水就无法生存.
5)在季节、月份、节日、 假日、日期、星期等表示时间的名词之前,不加冠词;
We go to school from Monday to Friday.我们从星期一到星期五都上课.
6)在称呼或表示官衔,职位的名词前不加冠词;
The guards took the American to General Lee.
士兵们把这个美国人送到李将军那里.
7)在三餐、球类运动和娱乐运动的名称前,不加冠词 如:have breakfast,play chess
8)当两个或两个以上名词并用时,常省去冠词;
I can't write without pen or pencil.没有钢笔和铅笔,我就写不了字.
9)当by 与火车等交通工具连用,表示一种方式时,中间无冠词;by bus,by train;
10)有些个体名词不用冠词;如:
school,college,prison,market,hospital,bed,table,class,town,church,court 等个体名词,直接置于介词后,表示该名词的深层含义;
go to hospital 去医院看病
go to the hospital 去医院 (并不是去看病,而是有其他目的)
11)不用冠词的序数词;
a.序数词前有物主代词
b.序数词作副词 He came first in the race.
c.在固定词组中 at (the) first,first of all,from first to last

第二个用an你没有问题吧?!
问题应该是前面那个空为什么不填!
不填的原因是:director of the Chinese Earthquake Research Center这不是一句完整的话,只是用来修饰Chen jianmin 起说明作用的成份。
这也是英语的习惯表达,非要问个为什么的话,真的不好弄。碰到多了,你就明白了!...

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第二个用an你没有问题吧?!
问题应该是前面那个空为什么不填!
不填的原因是:director of the Chinese Earthquake Research Center这不是一句完整的话,只是用来修饰Chen jianmin 起说明作用的成份。
这也是英语的习惯表达,非要问个为什么的话,真的不好弄。碰到多了,你就明白了!

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1.a
2.the