根据网考网考试中心的统计分析，以下试题在2018/1/18日托福考试习题练习中，答错率较高，为：76%
【单选题】 Medical research at the cellular level, __________research on the immune system,has been made possible through twentieth-century advances in techniques of genetic research.
A．( which
B．( whereas
C．( such as
D．( is also
网考网参考答案：C，答错率：76%
网考网试题解析：
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