单项选择题

The main idea of this passage is that ______.

A．nitinol is a highly versatile metal
B．nitinol helped make the space program a success
C．nitinol has revolutionized dental care
D．most alloys have "memories"

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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

单项选择题

What is the main purpose of the passage

A．To review Oates's By the North Gate.
B．To compare some modern writers.
C．To describe Oates's childhood.
D．To outline Oates's career.