下列哪种白血病一般不常规作脑膜白血病的预防性鞘注（） A.急性粒细胞白血病M2 B.

甲、乙两个码头相距308.7千米，一艘轮船从甲码头开往乙码头，3小时行了73.5千米。照这样的速度，几小时可以到达乙码头？

根据中文填入单词。

1. Children must keep ________ (他们) away from water and fire.

2. It's too cold. Please keep the window ________ (关着)

3. Tell these ________ (参观者) not to write on the wall.

4. Rabbits like eating carrots. So he often ________ (喂) some to his rabbit.

5. My bird is covered with beautiful ________ (羽毛).

6. Suzy is weak at ________ (地理), so she is trying to work harder on it.

7. Cover yourself with a ________ (毛毯)if you feel cold.

8. Who is ________ (感兴趣) in camping with us in summer?

9. The whisper behind the tree made me feel ________ (恐惧).

10. He is so ________ (粗心) that he often makes a few mistakes in his homework.

多种感官参与学习能有效地增强记忆。（　）

知识经济属性表明，科学知识在认识论上意义上是一种：（）

A.网络知识经济；

B.进化系统；

C.直接生产力；

D.间接生产力。