五四时期，毛泽东参与发起的进步社团是 ()

A baby might show fear of an unfamiliar adult, _______ he is likely to smile and reach out to another infant.

男， 36 岁，间断性咳嗽、咳黄脓痰 20 余年，三天前出现发热，痰中少量带血。幼年曾患百日咳。为明确诊断，最有意义的检查是

Others argue that since the earth has endured a long string of ice ages in the last two millionto three million years, any warming is ________ to be temporary.

“植物性神经系统”这个名词的提出者是

可能出现心尖部舒张期隆隆样杂音的是

中国社会主义改造的道路是 _______。

Human behavior is mostly a product of learning ________ the behavior of animals dependsmainly on instinct.

与眼视近物所作的调节无关的反射活动是？

When he suddenly ________ up the subject of genetic engineering, there was an embarrassedsilence.