If you need to go to the restroom in class, please your hand.
A:raise
B:rise
C:shake
D:wash
125×80=____
37×2×5=____
40×25=____
28×50=____
50×150=____
补全成语
①____声匿迹 ②物____天择 ③____然无存
④长途____涉 ⑤巧妙绝____ ⑥无动于____
下列做法中能促进植物呼吸作用的是( )