伟晶岩在形成的早期以结晶作用为主，在晚期则以交代作用为主。()
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The term "heavy user" used in the text refers mainly to______.
A. overweight eaters
B. people who are willing to spend the most money on fast food
C. people who frequently ate at a fast food restaurant
D. people who would order larger orders at a time
酸性和中酸性的铝硅酸盐岩石风化后易形成残余型高岭土矿床。()
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