单项选择题

When the mixture is used, it is important to ________.

A．keep sugar and salt in water
B．drink it as often as necessary
C．take it as much as possible
D．use it to kill the bacteria
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单项选择题
The writer wants to change her job because ________.
A．she has difficulty handling her daily work efficiently
B．she can hardly get a chance to be promoted
C．she finds her present job too challenging
D．she is tired of her duties at the college
单项选择题
According to the passage, we give school children difficult problems to solve in order to ________.
A．encourage them to learn
B．teach them to fear the pain of solving the problem
C．help them learn to deal with pain
D．teach them how to respect from the problem
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