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【简答题】
阅读短文,用合适的单词完成下列短文。 A Foreign Teacher Mr. Brown is from New York (纽约) of America. He teaches English in our school. He wears a white shirt and black trousers every day. He speaks English very well. He can speak some Chinese, but not too much. He likes teaching in China very much. He often says the Chinese are very friendly. We like his lessons very much. He is our good friend. Mr. Brown is an ______ (1). He is a ______ (2) of English in our school. He is ______ (3) a white shirt and black trousers every day. He speaks very ______ (4) English. He can speak some Chinese, ______ (5), but ______ (6) ______ (7) ______ (8). He often says the Chinese ______ (9) are very friendly. We all like him and his ______ (10).
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【单选题】植物生活离不开水,其原因不包括(  )
A.
环境中水越多植物生长的越好
B.
干种子必须吸足水才能萌发
C.
植物进行光合作用需要水
D.
土壤中的无机盐必需溶解在水中才能被根吸收
【简答题】已知函数 y= 2-x 2+x +lg(- x 2 +4x-3) 的定义域为M. (1)求M; (2)当x∈M时,求函数f(x)=a?2 x+2 +3?4 x (a<-3)的最小值.
【单选题】下列不属于考古学研究范畴的是?
A.
墓葬
B.
城址
C.
陶器
D.
恐龙
【简答题】已知函数y=log a (3+2x-x 2 ). (1)讨论此函数的单调性; (2)当 a= 1 2 时,求函数的值域.
【简答题】运动神经末梢与肌细胞接触的部位称为__________,运动神经末梢释放的神经递质是__________,与终板膜上的__________受体结合,使终板膜对__________ 通透性增加,在终板膜上产生 __________电位。
【单选题】Water fleas, rotifers and seed shrimps are ______.
A.
food of the birds
B.
enemies of the birds
C.
different kinds of fish
D.
waterborne invertebrates
【简答题】已知y=3x-2,求x=0,-1,2,a, 时的函数值。
【简答题】已知函数y=ax 2 (a≠0)与直线y=2x-3交于A(1,b) 求:(1)a和b的值; (2)当x取何值时,二次函数y=ax 2 中的y随x的增大而增大; (3)求抛物线y=ax 2 与直线y=2x-3的另一个交点B的坐标.
【简答题】已知函数y=ax 3 +bx 2 ,当x=1时,有极大值3. (1)求a,b的值; (2)求函数y的极小值.
【判断题】检定菌应当有适当的标识,内容至少包括菌种名称、编号、代次、传代日期、传代操作人。
A.
正确
B.
错误
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