单选题：The walls are made of hollow concrete blocks。

题目内容：

The walls are made of hollow concrete blocks。 A．big
B．long
C．new
D．empty

参考答案：

答案解析：

Newborn babies can discriminate between a man’s and woman’s

Newborn babies can discriminate between a man’s and woman’s voices. A．treat B．ex

分类：理工类题型：单选题

The expression "this form of life" in paragraph 5 refer to? A．Water-based life.

分类：理工类题型：单选题

The earthquake that hit the eastern half of the United States two centuries ago

分类：理工类题型：单选题

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在各国期货交易所进行的自律管理中，制定客户定单处理规范的规定主要涉及的内容包括（　　）。A．对所使用的指令类型作出特别的限定 B．要求公平、合理、及时地执行交易

分类：理工类题型：单选题