J argues that many biological traits are not hte products of natural selection favored because they enhance reproduction or survival, ( ...) simply random by-products of other evolutionary developments.
这题是PREP中原题,应该是BUT ARE,因为BUT有介词的意思,就是除了。。。如果是BUT,很可能会造成歧义,就是they enhance reproduction or survival, ( ...) simply random by-products of other evolutionary developments,将 reproduction or survival but simply random by-products..这三个并列了,加了ARE就很确定是连词,消除歧义
这题是PREP中原题,应该是BUT ARE,因为BUT有介词的意思,就是除了。。。如果是BUT,很可能会造成歧义,就是they enhance reproduction or survival, ( ...) simply random by-products of other evolutionary developments,将 reproduction or survival but simply random by-products..这三个并列了,加了ARE就很确定是连词,消除歧义