单选题：证券经纪商为投资者办理经纪业务的前提条件是投资者必须事先在（　　）开立证券账户。

题目内容：
证券经纪商为投资者办理经纪业务的前提条件是投资者必须事先在（　　）开立证券账户。 A．证券公司或其代理点
B．证券交易所或其代理点
C．中国结算公司或其代理点
D．商业银行或其代理点
参考答案：
答案解析：

Genetic engineering may be defined as

Genetic engineering may be defined as A．the altering of normal cell reproduction

分类：证券交易(旧版)  题型：单选题
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The weather was crisp and clear and you could see the mounta

The weather was crisp and clear and you could see the mountains fifty miles away

分类：证券交易(旧版)  题型：单选题
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Caffeine withdrawal symptoms

Caffeine withdrawal symptoms A．can become an ongoing problem. B．may last as long

分类：证券交易(旧版)  题型：单选题
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Caffeine is used to

Caffeine is used to A．reduce high blood pressure. B．cure liver cancer. C．relieve

分类：证券交易(旧版)  题型：单选题
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