对淋巴窦的错误描述是（）。A.淋巴窦壁的通透性大，故淋巴在其内的流速较快 B.淋巴窦

用适当的介词填空。

1. Liu Hang sits _______ the right side of the classroom. Li Gang sits in the front.

    Zhang Xia sits next _______ him.

2. —Do you sit _______ the center of the classroom?

    —No, I sit on Meimei's right. We sit _______ the front now.

3. Look _______ the picture. There is a pig _______ it.

4. Can you see the blackboard _______ the wall?

    My teacher is drawing a tree _______ it.

5. There are some public phones _______ the street.

6. You can see the post office _______ the corner of the street.

7. There is a bird _______ the sky (天空).

8. My mother gets home _______ 6 o'clock every afternoon.

下列保存物质的方法不正确的是（   ）

A．单质铝可敞口保存于空气中

B．硅酸钠溶液放在带玻璃塞的无色试剂瓶里

C．少量金属钠可存放在煤油里

D．浓硝酸放在带玻璃塞的棕色试剂瓶里

I can hardly________very loud noise while I am studying.[ ]

A. keep away from  

B. put up with

C. have efforts on  

D. get rid of

保险营销以( )作为营销中心。

A．保险产品
B．满足消费者的需求
C．将保险产品转移给消费者
D．保险市场的调研

男性，30岁，1周来发热伴皮肤出血点。化验血呈全血细胞减少，骨髓检查增生极度活跃，原始细胞占骨髓非红系有核细胞的40%，各阶段粒细胞占50%，各阶段单核细胞占30%，诊断急性白血病，其FAB分类的类型是（）。

A．M₁

B．M₂  

C．M₄  

D．M₅  

E．M₆