【名词&注释】
有效性(effectiveness)
[单选题]61_____
A. mixing
B. weakening
C. maintaining
D. assessing
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举一反三：
[单选题]From Paragraph 5,we can learn that_______.
A. mushrooms should not be eaten
B. vegetables are safer than meat and seafood
C. natural poisons are more dangerous than chemicals
D. different types of food should be handled differently
[单选题]Which of the following is the best title for the passage?
A. A Winner’s Secret.
B. A Winner’s Problem.
C. A Winner’s Opportunity.
D. A Winner’s Achievement.
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