Even with the new development in research, only a tiny ________ of all tests are done without using animals.
- A. variety
- B. amount
- C. plenty
- D. proportion
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正确答案： D
本题解析：
本句的意思是：“即使研究有了新的发展， 只有一小部分的试验可以不用动物” 。因此答案为 D。variety 和 plenty 分别表示“多样”和“大量的”，意思不合适。 amount 后只能接不可数名词，而 test 是可数名词。
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