题目内容
20. Broccoli _____, can prevent the human body from being damaged by oxidant environment .
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19. Scientists can’t reach yet because their relationship is very complicated.
18. It is suggested that Mars rocks even at high temperatures.
17._____these pictures,I couldn’t help thinking of those days when I was in Beijng.
16. The number of people _____ fifty, but many of them absent for different reasons.
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