正确答案: A

Black college students and whites．

题目：Who are the first to make the success of sit-in become true?

解析：第三段。一群黑人大学生和白人大学生认为黑人与白人一样有权利在餐厅内吃饭。选项A是正确的。

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学习资料的答案和解析：

[单选题]下列诗歌属于绝句的是

杜牧《泊秦淮》

[单选题]Which of the following shows that a person is NOT dreaming in his sleep?

根据以下内容，回答下面的题目。Researchers have found that REM (rapid eye movement) sleep is important to human beings．This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence．The deeper a person’s sleep becomes, the longer the periods of rapid eye movement．There are physical charges in the body to show that a person has changed from NREM (non-rapid eye movement) to REM sleep．Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly．Accompanying these physical changes in the body is a very important characteristic of REM sleep．It is during REM sleep that a person dreams．According to the passage, how often does REM sleep occur in one night?

His heart rate increases．

[多选题]关于肺部听诊，下列正确的是（　　）

一般由肺尖开始

自上而下检验前胸部、侧胸部和背部

要在上下、左右对称的部位进行对比

被检查者取坐位或卧位

[多选题]尿的浓缩与稀释机褂取决于（　　）

肾髓质渗透梯度

ADH的分泌

[单选题]中枢化学感受器最敏感的直接刺激物是（　　）

脑脊液中的H+

[单选题]壶腹周围癌 （　　）

根据题干回答下面的题目下列各种震颤，最常见于何种疾病?胸骨左缘第2肋间触及收缩期震颤 （　　）

胆囊肿大呈囊性感，无压痛