单项选择题

Some health experts say food makers should add some elements ______people won't lack these essential substances.

A．since
B．therefore
C．for the purpose that
D．for the effect that
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单项选择题
The best way to learn [low to behave in the working world is______.
A．to find a person you respect and watch how he acts
B．to find a person you admire and make friends with him
C．to find a worker and follow him closely
D．to make the acquaintance of a model you admire
单项选择题
In the last line of the second paragraph, the word approach means
A．means of entering
B．manner of doing something
C．speaking to someone for the first time
D．way of coming nearer to
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