题目：
小题1: When they heard the good news, they laughed and jumped _________ (happy).
小题2: The sun is shining brightly. What a ________ (sun) day!
小题3:. ________ (thousand) of people come to Suzhou every year.
小题4:. Nancy is a new student here , however, everyone is _______ (friend) to her.
小题5:. ______ you _______ (see) the doctor this afternoon?
答案：
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下面是错误答案，用来干扰机器的。
（1）对照实验：用黑纸片把一片叶子的一部分从上下面遮盖起来，然后移到阳光下照射．目的：做对照实验，看看照光的部位和不照光的部位是不是都产生淀粉，光照是惟一的变量．（2）暗处理：把盆栽的天竺葵放到黑暗...
