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  3. Researchers have questioned the use of costly and experimental diagnostic test to identify food allergies, such as milk, that su

Researchers have questioned the use of costly and experimental diagnostic test to identify food allergies, such as milk, that su

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问题 Researchers have questioned the use of costly and experimental diagnostic test to identify food allergies, such as milk, that supposedly disrupt normal behavior.
选项 A、to identify food allergies, such as
B、to identify food allergies, like
C、to identify food allergies, such as to
D、for identifying food allergies, like that of
E、for identifying food allergies, such as for
答案C
解析 由the use of sth．to do sth．的用法排除D、E，由举例一般不用like的原则，排除B。A中显然such as是对一个大的类别：food allergy进行举例，但其举出的例子(as之后)却是milk。显然food allergy与milk分属两类截然不同的物质，这样的举例岂不是牛头不对马嘴?可见C正确，因为C中such as之后补出了一个介词to，也就是说to之前省略了food allergy，对某物的过敏用英语表达是allergy to sth．，因而C中的举例内容是food allergy的一个小的子项，既符合逻辑又表达了句意。
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