2. 外语
  3. ______ (当涉及对心脏病及其对身体的影响的研究时), we do not have adequate substitutes for the use of animals.

______ (当涉及对心脏病及其对身体的影响的研究时), we do not have adequate substitutes for the use of animals.

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问题 ______ (当涉及对心脏病及其对身体的影响的研究时), we do not have adequate substitutes for the use of animals.
选项
答案When it comes to researches into heart disease and its effects on the body
解析 本题测试句式when it comes to... 和后面几个词语research into，effects on的用法。
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大学英语六级

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