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单选题

A．Amber mined from the Appalachian Mountains.
B．Amber with no imperfections.
C．Amber containing organic material.
D．Amber with no inclusions.

参考答案C

解析: What type of amber is probably the most valuable for genetic research?
推断题。题目问什么品种的琥珀对于基因研究最有价值，根据最后一句可知是能够提取DNA的。因此，正确答案是C。

单选题

A．The difficulties faced by the colonists.
B．The skill of military heroes.
C．The courage of one man.
D．The cause of the Revolutionary War.

单选题

A．He did not fight in the Revolution my War.
B．He did not really exist.
C．He was an important town leader.
D．He was not the only messenger.

单选题

A．It was well planned.
B．It was completed in a short time.
C．It was led by military commanders.
D．It helped him get elected to public office.