单项选择题

Based on the passage we can safely conclude that if our diet is not comprehensive enough______.

A．vitamin pills are of no avail
B．nutritious food might be unhealthy
C．vegetable leaves can be a good remedy
D．religions fasting may help out a lot
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单项选择题
What is the purpose of the author in writing this passage
A．Legs become weaker.
B．Modem means of transportation make the world a small place.
C．There is no need to use eyes.
D．The best way to travel is on foot.
单项选择题
Traveling at high speed means ______.
A．people's focus on the future
B．a pleasure
C．satisfying drivers' great thrill
D．a necessity of life
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