Question

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

New parents who clean their homes very often1.（protect）their babies from bacteria and other organisms might want to cut back their efforts.

A new study suggests that high levels of contact with cleaning products are linked to2.increased risk of the childhood breathing condition3.（know）as asthma（哮喘）.

4.（researcher）asked a group of parents how often they used 26 common household cleaners during their babies’ first three to four months of life. By age three, the children who5.（come）in contact with cleaning products the most were 37 percent more likely to have asthma than children with the6.（little）contact.

The study also found that a lot of exposure to cleaning products caused children to be 35 percent more likely to have much difficulty7.（breathe）.In addition, they were 49 percent more likely to have certain allergies.

The leading researcher Tim Takaro told the Reuters news service he understands that parents want to make their homes safe8.their children. He said parents should read labels and look for products that are free of substances（物质）like9.（chemistry）colors and smells. Also, they should consider natural cleaning products instead of harmful10.

Answer

1.to protect

2.an

3.known

4.Researchers

5.had come

6.least

7.breathing

8.for

9.chemical

10.ones

【解析】

这是一篇说明文。一项新的研究表明，过多接触清洁用品会增加儿童患哮喘的呼吸疾病的风险。同时这项研究还发现，大量接触清洁用品会使儿童患上严重呼吸困难的可能性增加35% 。 此外，他们有49% 的可能性对某些物质过敏。

1.考查不定式。本句为含有定语从句的复合句。其中who…other organisms为定语从句，修饰先行词new parents。定语从句里protect their babies from bacteria and other organisms 作目的状语，表明经常打扫屋子的目的。故填to protect。

2.考查冠词。句中be link to“和……有联系”，to 是介词，其后跟名词。又risk为可数名词，所以在其前有修饰的时候，该修饰要加上冠词，表示“一个……的风险”。由于increased是以元音因素开头，所以用不定冠词an。故填an。

3.考查过去分词作定语。句中know as asthma 作breathing condition的后置定语，又know as“作为……而熟知”常用被动形式，故填known。

4.考查可数名词复数。句意：研究人员对一些父母进行了调查，询问他们在孩子出生后三到四个月使用26种常见家用清洁剂的频率。本句中researcher为可数名词，结合句意，此处要用复数形式；因起位于句首，所以首字母大写。故填Researches。

5.考查过去完成时。当时间状语是“by+时间点”时，句子的时态用完成时。当时间点表示过去，句子用过去完成时；时间点表示现在，常用现在完成时。句中age three,表示过去的时间，所以此处用过去完成时。故填had come。

6.考查形容词最高级。句意：3岁时，接触清洁产品最多的孩子比接触最少的孩子患哮喘的可能性高37% 。由句中的than 知道，此处表示前后两种情况的对比：前面 the children who … the most，所以than后面 children with the …contact.就应该是little的最高级least。故填least。

7.考查固定搭配。句中：have difficulty (in)doing sth.“做……有困难”为固定搭配。故填breathing。

8.考查介词。句意：首席研究员 Tim Takaro 告诉路透社记者，他理解父母希望他们的孩子在家里安全。safe for sb.“对某人是安全的”，为固定结构。故填for。

9.考查形容词。名词前要用形容词来修饰，故填chemical。

10.考查代词。句意：此外，他们应该考虑自然清洁产品，而不是有害的。Instead of “代替，而不是”，在句中起并列作用，所以，其后应该指的是有害的产品。因为products在前面已经出现，此处要用代词来指代。ones常用来指代已提过的复数事物名称。故填ones。