单项选择题

What was NASA accused of on Wednesday

A．Being too prudent and cautious.
B．Being too hasty to assure safety.
C．Causing the Columbia tragedy.
D．Delaying launch plans.
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单项选择题
Why does the professor mention bones and shells
A．To give an example of natural shapes.
B．To describe early sculpture.
C．To illustrate their use as tools.
D．To demonstrate their role as decorative objects.
单项选择题
What is the principle idea of the laisser faire policy
A．The rights of private business owners should be protected.
B．The government shouldn’t interfere in private business.
C．Politicians should support industrial growth.
D．Competition among companies should be restricted.
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