【单选题】反刍家畜日粮中补充微量元素钴,可促进瘤胃微生物利用钴合成( )。
【简答题】下列说法正确的有( ) A.整数包括和负整数 B.零是整数,但不是正数,也不是负数 C.分数包括正分数、负分数和零 D.有理数不是正数就是负数
【简答题】The Pilgrims were very _________ (gratefully) and thus we get the name Thanksgiving.
【单选题】When did Sam____the train station? [ ]
【简答题】阅读技能、写作技能、运算技能、解题技能等属于____技能。
【简答题】We thus easily get into great difficulties from the necessity of viewing culture, at one moment, as a part of the man and, at another moment, as a part of the environment.