考研英语长难句讲解 第141期

 9.Among the most popular : paternity and kinship testing , which adopted children can use to find their biological relatives and families can use to track down kids put up for adoption¹.

【分析】复合句。句子的主干是Among the most popular : paternity and kinship testing...。因主句省略了谓语动词，此处冒号相当于be动词are。Which引导定语从句，先行词是paternity and kinship testing。定语从句本身又是由and连接的并列句，which在定语从句中作两个use的宾语，put up for adoption是过去分词短语作kids的定语。

【译文】在基因检测中，最受欢迎的是父子血缘关系测试——被收养的孩子可以利用这个测试找到自己生物学上的亲戚，家庭也可以用此来追查被受养孩子的下落。

【点拨】1）track down 意思是“跟踪找到，追查到”。2）put up for adoption指“将···送给别人收养”。

【临摹】多年来我一直在打听一些老朋友的下落。

10.This DNA² can reveal genetic³ information about only one or two ancestors , even though , for example , just three generations back people also have six other great-grand-parents or , four generation back , 14 other great-great-grandparents .

【分析】复合句。句子的主干为This DNA can reveal genetic information... 。Even though引导让步状语从句，从句由or连接的两个并列分句构成。并列结构中的同等句子成分省略。

【译文】举例来说，只要上溯三代，一个人就会有八个曾祖父母，或者上溯四代，就会有十六个曾曾祖父母，即便如此，这种DNA只能揭示一到两位祖先的基因信息。

临摹答案

2.The sudden noise from the next room interrupted my trains of thought.

3.The more learned a man is , the more modest he usually is .

4.Many primary schools shut down early for the vacation for fear of the advent⁴ of earthquake.

6.He will break school rules if he goes on playing truant⁵ .

7.It is William who is not very cheerful and thus needs s holiday to pull himself together.

9.I’ve been trying to track down some old friends over the years .

1 adoption   

n.采用，采纳，通过；收养

参考例句：

• An adoption agency had sent the boys to two different families.一个收养机构把他们送给两个不同的家庭。
• The adoption of this policy would relieve them of a tremendous burden.采取这一政策会给他们解除一个巨大的负担。

2 DNA   

(缩)deoxyribonucleic acid 脱氧核糖核酸

参考例句：

• DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
• Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。

3 genetic   

adj.遗传的，遗传学的

参考例句：

• It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
• Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。

4 advent   

n.(重要事件等的)到来，来临

参考例句：

• Swallows come by groups at the advent of spring. 春天来临时燕子成群飞来。
• The advent of the Euro will redefine Europe.欧元的出现将重新定义欧洲。

5 truant   

n.懒惰鬼，旷课者；adj.偷懒的，旷课的，游荡的；v.偷懒，旷课

参考例句：

• I found the truant throwing stones in the river.我发现那个逃课的学生在往河里扔石子。
• Children who play truant from school are unimaginative.逃学的孩子们都缺乏想像力。