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1．(2019·全國Ⅰ) Modern methods ___63___ tracking polar bear populations have been employed only since the mid-1980s.

答案  for/of

考查介詞用法。此處tracking polar bear populations作Modern methods的定語，用of連接，“methods of doing sth.”意為“……的方法”，構成固定結構；或者意為“對于跟蹤北極熊的方法”用for。故填of/for。

2. (2018·全國Ⅲ) I was searching ________ these three western lowland gorillas I’d been observing.

答案　for

解析　search for尋找，為固定搭配。

3．(2017·全國Ⅰ) This trend，which was started by the medical community(醫(yī)學界) ________ a method of fighting heart disease，has had some unintended side effects such as overweight and heart disease—the very thing the medical community was trying to fight.

答案　as

解析　此處指作為抵抗心臟病的一種方法。as表示“作為”，故填as。

4．(2017·全國Ⅲ) After school she plans to take a year off to model full-time before going to university to get a degree ________ engineering or architecture.

答案　in

解析　get a degree in在……方面獲得學位，是固定搭配。

5．(2017·全國Ⅱ) It ran for just under seven kilometers and allowed people to avoid terrible crowds on the roads above as they travelled to and ________ work.

答案　from

解析　和and前的to對應，用from。to and from意為“來回”。

6．(2016·10月浙江) Drinking my iced coffee，I ran my fingers along the streets ________ the hotel to the opera hall.

答案　from

解析　這里指的是從賓館的位置到歌劇廳的位置。from...to...為固定搭配，意為“從……到……”。故填from。

  In the chemistry lab，because 21.________ the student’s carelessness，the tube cracked and the liquid in it caused a fire on the table.Fortunately，he put it out 22.________ time at last.

  In fact，it is common to have some small accidents caused 23.________carelessness.I used to enjoy cooking，so I always sought a chance to cook.However，the desire led 24.________ an accident.

    Once I stayed 25._______home alone.I found it a chance to cook.I put all the food I needed 26.________ a pot.Then I had to wait 27.________ it to boil.In order to kill the waiting time，I went to watch TV.Only in a few minutes was I fascinated by a wonderful programme.It was about half an hour later that I remembered my food.I turned 28.________ the cooker immediately but unfortunately the food ran over 29.________ the pot.I was blamed and had to clean the kitchen.

    So we should pay attention 30.______ everything we are doing to avoid accidents.

21．答案　of

解析　設空處后的中心詞為名詞carelessness，設空處前為because，由此可判斷設空處填of，because of是介詞短語，意為“由于”。

22．答案　in

解析　句意為：幸運的是，最后他及時將火撲滅了。in time及時。

23．答案　by

解析　句意為：事實上，由于粗心而導致一些小事故很常見。by放在過去分詞后，意為“被，由”。本句中caused by carelessness作定語，修飾accidents。

24．答案　to

解析　句意為：然而，這種做飯的欲望卻導致了一次事故。lead to動詞短語，意為“導致”。

25．答案　at

解析　句意為：一次我獨自待在家里。stay at home為固定短語，意為“待在家里”。

26．答案　into

解析　句意為：我將我所需要的所有食物都放進一口鍋里。put...into...將……放進……。

27．答案　for

解析　wait for固定短語，意為“等待”。

28．答案　off

解析　turn off關閉(煤氣、電路等)。

29．答案　from

解析　run over from從……中溢出。

30．答案　to

解析　pay attention to為固定短語，意為“注意”。