题目内容

____, an accident happened to his brother.

A. Fortune
B. Fortunately
C. Unfortunately
D. Unfortunate

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WTO stands for the World Trade ____.

A. organization
B. organize
C. organizer
D. organized

He is a good ____. He often practices playing the piano.

A. player
B. worker
C. piano
D. pianist

This place is very ____.

A. danger
B. dangerous
C. dangers
D. dangered

下列关于有机物叙述正确的是

A. 碳氢化合物及其衍生物
B. 有机物都具有碳氢氧元素
C. 熔点低的化合物都是有机物
D. 大多数有机物都易溶于水