单项选择题

Scurvy is a disease that is provoked by ______.

A．salted meat and biscuits
B．exhaustion
C．want of some essential substances
D．lack of fresh vegetables and fruits
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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
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.
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