下面哪些舵面能改善飞机操纵性能（）.

A、扰流板

B、前缘装置

C、后缘襟翼

D、以上都对

请根据句意从方框中选出合适的单词，并用其适当形式填空。

popular    begin     twin     slim     beautiful     little       luck

小题1:Mr Black spoke at the      of the meeting.

小题2:The boy is      in our class，and many students don^，t like him.

小题3:These clothes are the      .

小题4:It started to rain during the trip.      ，I brought my umbrella with me.

小题5:The family enjoyed the      of the park.

小题6: Kitty eats more vegetables and dances more often than Sandy. So Kitty looks ________ than Sandy.

小题7: Which city gets ________ rain every year, Zhenjiang, Beijing or Guangzhou?