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：

答案解析：

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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