单项选择题

We can infer that shopping and cooking in a foreign country ______.

A．are necessary for students to study systems
B．require people to know how to measure
C．tell one what is needed to learn to live there
D．help one learn measure words used in that country
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单项选择题
Many educators believe that the best way to master the basic rules of a system is ______.
A．learning them in the context
B．producing problems from context
C．memorizing the related words first
D．fixing attention on the rules themselves
单项选择题
The rules that we learn from context ______.
A．are easy to forget
B．are understood more deeply
C．are difficult to remember
D．are hard to comprehend
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