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【简答题】Now, we know that if we do not get enough vitamins, we are at the risk of developing a number of diseases. As a result, vitamin supplements( 补品 ), though expensive, are popular with people who worry t...
【单选题】From the passage we know that ammonium nitrate is a kind of ______.
A.
natural gas, which can easily catch fire
B.
fertilizer, which can't be stored in a great quantity
C.
poisonous substance, which can't be used in overcrowded areas
D.
fuel, which is stored in large tanks
【简答题】§ We know that a ca t, whose eyes can take in many more rays than our eyes can see clearly in the night .
【简答题】列举出四种服饰传播的表现形式。
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