氧气通过什么结构输送到全身各处？（　　）

算一算，比一比。

一只钢笔笔9元钱，一个文具盒比它贵了5元。买一个文具盒多少钱 ？

读出如图中各实验仪器的示数：

（1）金属条的长度____ 　cm，

（2）电压表示数____ V；

（3）弹簧测力计示数____ N．

阅读短文，根据短文内容，选择正确答案。

Bob: Hello, Candy! What are you going to do on Sunday?

Candy: Oh, I'm going to the park to have a picnic.        

Bob: Do you like having a picnic?

Candy: Yes, I do. What about you?

Bob: Me, too. But my favourite hobby is playing computer games.

I think it's very fun.

Candy: D o you want to go with us?

Bob: Sure. What time?

Candy: At 8:00 o'clock tomorrow.

Bob: OK. See you later.

Candy: See you.