题目
用小麦胚芽鞘切段伸长法鉴定IAA时,下述哪一项注意事项是不正确的? A.要挑选大小均匀的小麦种子,并萌发成幼苗后才能实验 B.实验操作要在较弱的光下进行 C.实验材料要切去胚芽鞘尖端 D.切段要在水中漂洗后,才能测定 答案:DWhile she ______ the newspaper, Granny ______ her.
A.read; was
telephoning B.is reading;
telephoned
C.was reading;
telephoned D.read;
telephone