单项选择题


A．answers
B．questions
C．standards
D．results
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Scientists once estimated that Earth’s crust started shifting three billion years ago.
A．Right
B．Wrong
C．Not mentioned
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Supertasters prefer high-salt cheese because
A．it is good to health.
B．it is rich in nutrition.
C．it has intense bitter tastes.
D．it tastes less bitter.
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