2. 外语
  3. Complete the summary below. Choose ONE WORD ONLY from the passage for each answer. Write your answers in boxes 21-26 on your ans

Complete the summary below. Choose ONE WORD ONLY from the passage for each answer. Write your answers in boxes 21-26 on your ans

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问题 Complete the summary below.
Choose ONE WORD ONLY from the passage for each answer.
Write your answers in boxes 21-26 on your answer sheet.
Oxytocin research
The earliest findings about oxytocin and bonding came from research involving 【R21】______ It was also discovered that humans produce oxytocin during 【R22】______ An experiment in 2005, in which participants were given either oxytocin or a 【R23】______, reinforced the belief that the hormone had a positive effect.
However, later research suggests that this is not always the case. A study at the University of Haifa where participants took part in a 【R24】______revealed the negative emotions which oxytocin can trigger. A study at the University of Antwerp showed people’s lack of willingness to help 【R25】______while under the influence of oxytocin. Meanwhile, research at the University of Amsterdam revealed that people who have been given oxytocin consider 【R26】______that are familiar to them in their own country to have more positive associations than those from other cultures.
【R23】
选项
答案placebo
解析 题目：在2005年的实验中，实验对象使用的不是催产素，就是……审题可知此处讲的实验，实验需要有对照组(即一组使用某种药物，而另一种不使用，来做对比分析)。原文中提到，一组人吸入了催产素，而另一组得到的是安慰剂；was given的同义替换词是received。因此答案为placebo。
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