单项选择题

What is the main idea of the first paragraph

A．Where there is a will, there is a way.
B．It is easy to recall instances of encountering a proverb.
C．It is not easy to define the word "proverb".
D．An accepted definition should cover all specifics of the word "proverb".

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单项选择题

A good mixed diet ______.

A．normally contains enough vitamins
B．still needs supplementing with vitamins
C．is suitable for religious fasting
D．is often difficult to arrange

单项选择题

The ingredient missing from milled rice ______.

A．was vitamin B
B．did not affect the chickens
C．was named the Eijkman vitamin
D．has never been accurately identified