单项选择题

A．in order that
B．so that
C．as long as
D．because
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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 will the students read about for homework
A．Newton’s life and times.
B．The influence of earlier scientists on Newton’s ideas.
C．How gravity repels objects very close to each other.
D．How the current theory resolved contradictions in earlier ones.
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