单选题：Ryan, with the help of others, is fulfilling his dream of he

题目分类：卫生类
题目类型：单选题
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题目内容：

Ryan, with the help of others, is fulfilling his dream of help African people to________. A．make new materials
B．preserve wetland and animals
C．have clean air
D．have clean water
E．collect cigarette butte
F．collect despoiled oil

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答案解析：

期货交易双方所承担的盈亏风险都是无限的，而期权交易买方的亏损风险是有限的，盈利则可能是无限的。（　　）

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Paragraph 3________.

Paragraph 3________.A．Provide Clean Water B．Dig 0il Wells C．Save Clean Water D

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Horse-racing fans cannot be considered sportsmen because th

Horse-racing fans cannot be considered sportsmen because they are spectators wh

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A red flag was placed there as a token of danger．

A red flag was placed there as a token of danger．A．sign B．substitute C．proof D．

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When did Einstein begin teaching?

When did Einstein begin teaching?A．In 1901． B．In 1902． C．In 1910． D．In 1879．

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