题目内容

烷烃分子中碳原子的空间构型是（）

A. 四面体型
B. 平面四边形
C. 三角形
D. 线型

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下列有机物的命名正确的是()

A. 2-乙基丁烷
B. 2,2-二甲基丁烷
C. 3,3-二甲基丁烷
D. 2,3,3-三甲基丁烷

Scientists say that laughter is ________.

A. good for us
B. serious
C. not really good
D. the worst medicine

Laughter is good for _________.

A. our whole body
B. only the face
C. only the chest and shoulders
D. only the circulation

Laughter clubs ________.

A. are only in India
B. are places to learn jokes
C. help people feel better
D. are free