树木______ 、_______ 、_______和_______ 的总称。《树木学》是研究树木的形态,分类、地理分布、_________及 ________、 资源利用及其在林业生态工程、经济开发中的定位与作用的学科。
He asked me ___________ Zhang Hua came to school or not.
— What would you like to have, meat or fish?
— _____________________.
— ___________________
— Once or twice a week.
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