任何品种对外界环境条件都各有一定的适应性,这种适应性就是良种在生产应用上的局限性和区域性。
参考答案:对
句型转换。(每空1分,共8分)
小题1:Bill hardly ever comes to school late. (对划线部分提问)
__________ _________ does Bill come to school late?
小题2:I spent 100 yuan buying the dictionary.(同义句转换)
It _______ _______100 yuan to buy the dictionary.
小题3:Lily has to babysit the child every Sunday.(改一般疑问句)
_____ Lily _____ to babysit the child every Sunday?
小题4:下雨时,她乘出租车。(补全句子)
When it __________,she _____________ the taxi.
测定六价铬时,若样品中存在次氯酸盐氧化物质干扰,可在样品中加入适量的硫酸、磷酸和脲素之后,再加入适量的()溶液来消除干扰。
A.高锰酸钾
B.亚硝酸钠
C.硫酸铵