四级Those who did well on the memory test had an increase in levels of immunoglobulin A, an antibody that’s the body’s first line of defense against germs.
那些在记忆测试中表现良好的人,免疫球蛋白A的水平增加了,免疫球蛋白质A是人体抵抗细菌的第一道防线。
2005年12月大学英语四级(CET-4)真题
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