My name is Tommy Wang. T-O-M-M-Y, Tommy, W-A-N-G, Wang. I am a Chinese boy. My telephone number is 85523963. My telephone is white. Look! This is my pencil box. ① It's big and beautiful. It's white. What's in it? This is ② ________ eraser. It's white. This is a pencil. It's white. ③ This is a ruler. It's white, too. I like white. I like green, too. Look! ④ My schoolbag is green. My notebook is green, too. But my favorite color is white.

    This is my good friend. His name is John. ⑤ He is English. Linda is John's sister. I like my friend. Like English.

判断句子正误。

复数$\frac{\sqrt{2}-i^3}{1-\sqrt{2}i}$=(       )

我们在打开饮料瓶时可看到瓶口冒出大量泡沫，哪冒出的气体是不是二氧化碳呢？有同学提出用澄清石灰水来检验．就这一过程而言，属于科学探究中的（　　）

测定木块和长木板之间的动摩擦因数时，采用图甲所示的装置（图中长木板水平固定不动）