动词填空。

1. The dog often             (bark) when someone rings the doorbell.

2.             (not open) the door. It's cold outside.

3. －How long ______ Wang Fang             (stay) in the hospital?

    －She stayed there for a week.

4. ______ Betty             (help) me with my maths tomorrow?

5. I look forward to             (see) you soon.

分析脑电图背景活动最重要的指标是（）。

A.α节律

B.β节律

C.δ节律

D.θ节律

E.δ和θ节律