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

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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

单项选择题

Witmer’s research leads people to believe ______.

A．Tyrannosaurus Rex had lips and Triceratops had cheeks
B．dinosaurs might have looked like mammals such as sheep
C．dinosaurs might net have looked like what we thought
D．dinosaurs must have looked like birds or crocodiles

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