A:黄瓜结果后,喷洒一定量的脱落酸可防止果实的脱落
B:小麦在扬花期受到大风袭击,影响了传粉,给小麦田喷洒了一定浓度的生长素,能避免小麦减产
C:用一定浓度赤霉素溶液处理黄麻、芦苇等植物,使植株增高
D:乙烯广泛存在于植物多种组织,主要促进果实的发育
根据短文内容判断下列句子正误。
Look! It's my school dining hall.We are here for lunch every day.Before,there were many tall trees.Ten years ago,there was only a small house in my school.There was no library or computer.The playground was also small.
Now,my school is very beautiful.The playground is big.The grass is green.We have PE and play sports on it.There is a nice teaching building in my school.It has six floors.The computer rooms are on the fourth floor and the library is on the sixth floor.We read books in the library and use the Internet in the computer rooms.
观察1+3=4 4+5=9 9+7=16 16+9=25 25+11=36这五道算式,找出规律,则下一道算式是____。
____
通过对照能够证明光合作用过程中产生的氧全部来自水的一组实验是