单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．Materials that are easy to shape.
B．The bones of men who made tools.
C．Stones that do not decay.
D．Ancient tools made from stone.
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单项选择题
A．Remove George from the committee immediately.B．Warn George that his attendance problem is serious.C．Offer to help George during the meeting.D．Telephone George to sec if he’s coming to the meeting.
A．Remove George from the committee immediately.
B．Warn George that his attendance problem is serious.
C．Offer to help George during the meeting.
D．Telephone George to sec if he’s coming to the meeting.
单项选择题
The author refers to the ocean bottom as a frontier in Paragraph 1 because it ______.
A．is not a popular area for scientific research
B．contains a wide variety of life forms
C．attracts courageous explorers
D．is an unknown territory
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