单项选择题

A．What is so-called Thanksgiving Day.
B．How to celebrate Thanksgiving Day.
C．The exact time of Thanksgiving Day.
D．The history of Thanksgiving Day.
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单项选择题
As used in the last paragraph of this passage, the word intricate means ______
A．abnormal
B．complex
C．regular
D．perfect
单项选择题
The passage suggests that ______.
A．nitinol is an organic metal
B．nitinol is stronger than any metal
C．nitinol's sensitivity to temperature changes makes it impractical for most uses
D．nitinol is better than stainless steel in jobs that require constant stress on the metal
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