观察目的：研究蚯蚓反应的实验。
观察准备：白纸、铅笔、浅盘、清水。
实验设计：
①把蚯蚓放在白纸上，观察它的爬行方式。
②用铅笔轻轻触碰蚯蚓，观察蚯蚓的反应。
③把蚯蚓放入装有少量常温水的浅盘中，观察它的反应。
实验现象：
—The Dragon Boat Festival is coming. I'm going to give a talk about it to the exchange students.
— Great! But don't forget to tell them _________.
下列程序
i=1
WHILE i＜8
i=i+2
s=2*i+3
WEND
PRINT s
END
输出的结果是____．
yesterday；washed；I；my；clothes；(．)
____
