单项选择题

What are salicylates

A．Leaves and tree bark.
B．The chemical in aspirin.
C．Aspirin tablets.
D．A Greek doctor.
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单项选择题
The information in paragraph 2 shows that ______.
A．aspirin can be dangerous
B．aspirin is always safe
C．aspirin has been around a long time
D．aspirin should be forbidden to apply to children
单项选择题
Newly-found fossilized tracks in Alaska proved that dinosaurs' migration between Asia and North America took place ______.
A．much earlier than experts previously thought
B．much later than experts previously thought
C．after Asia became an independent continent
D．sometime around 25 million years ago
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