东北师附中2022-2023学年高一年级下学期期末考试英语

东北师附中2022-2023学年高一年级下学期期末考试英语正在持续更新，目前金太阳答案为大家整理了相关试题及答案，供大家查缺补漏，高效提升成绩。

本文从以下几个角度介绍。

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D Crows have long been associated with wisdom.Wildlife biol- ogists figured this out by conducting a simple experiment using rubber masks.A "caveman"mask,for example,was designed as a“dangerous”face while a normal mask was“neutral(中立的)”. Researchers in the dangerous mask trapped and banded individual American crows and then released them.While they were careful not to harm the birds during trapping,"It's still a scary experience for the birds,says Kaeli Swift,a lecturer at the University of Washington. To see whether the crows remembered the dangerous face, researchers returned to the area and walked around wearing the different masks.And when the birds saw the dangerous face, Swift says,"They would alarm-call,and they would dive-bomb