根据所给单词完成句子。

1. I         (remain) in London until May.

2. John has____ (scoop) the soup into a big bowl.

3. What do you think is the most____ (help) dictionary?

4. It’s used for      (see) in the deep sea.

5. We need to prepare____ (drink) water when we go out for a picnic.

采用聚焦技术的主要目的是

A．抑制旁瓣效应

B．改善横向和侧向分辨率

C．提高帧频

D．减少超声伪像

E．改善超声的指向性