与酸碱均可以反应，并且均有气体生成的是[ ] A．NaHCO3 　 B．Al

阅读理解。

     One of my friends, Huanhuan, is a cat. She is four. She lives in Sichuan. She likes fish. She doesn't

like ice cream or strawberries.

     This is my friend, too. It is a nice dog. His name is Shuaishuai. He is two. He lives with me. He likes

meat. He doesn't like broccoli. He likes balls, too.

     This is me. My name is Mingming. I am twelve. I am in a middle school in Suzhou. I like fruit and

vegetables very much. I don't like eggs or meat.

1. How many friends does Mingming have? 

A. One.

B. Two.

C. Three.

D. Four.

2. Who likes meat, Huanhuan, Shuaishuai or Mingming? 

A. Huanhuan.

B. Shuaishuai.

C. Mingming.

D. Huanhuan and Mingming.

3. Where is Mingming from?

A. Sichuan.

B. Hangzhou.

C. Suzhou.

D. Shanghai.

4. Which sentence is RIGHT?

A. The dog's name is Huanhuan.

B. Mingming lives with his cat.

C. Shuaishuai and Mingming like meat.

D. Mingming is a boy of twelve.

5. Which one is the best title for this passage?

A. My Friends and I.

B. My Family.

C. A Cat and a Dog.

D. My Friends.

如图所示，表示某一物体作直线运动在0～5s内的运动图象，由于画图人粗心未标明v－t图还是x－t图，但已知第1s内的速度小于第3s内的速度，下列说法正确的是

A．该图一定是v－t图

B．该图一定是x－t图

C．物体的速度越来越大

D．物体的位移越来越大

小强为了研究催化剂对氯酸钾分解速率的影响，进行了如下实验：取5g氯酸钾样品（含少量不参加反应的杂质）与1g二氧化锰混合加热，每隔一段时间测定一些数据，所得数据如下表：

请你通过分析计算回答下列问题：

（1）表中有些空格缺少数据，尝试填满；

（2）从____时间开始，氯酸钾已经完全分解；

（3）5g氯酸钾样品中含杂质_______g；

（4）若用单位时间内实际分解的氯酸钾的质量表示氯酸钾的分解速率，则求从反应开始至1分钟时间段内氯酸钾的分解速率。

反映骨髓造血功能的最佳指标为

A．红细胞计数
B．血红蛋白测定
C．红细胞压积测定
D．红细胞形态学观察
E．网织红细胞计数

条痕色与表面的颜色不同的有（）

A.朱砂

B.自然铜

C.磁石

D.赭石