东北平原主要的农作物是（　　）

根据句意和所给的首字母完成单词
（1）In most parts of China, students r____  bikes to school.
（2） My family will take the t____  to Beijing next week.
（3） It's around 1,500 k____  from Beijing to Tianjin.
（4） They had a q____ meal and then went to school in a hurry.
（5） She is i____  in hospital. Let's go to see her after school.
（6）The e____  bird catches the worm.
（7）There is no m____  of getting there.  
（8） English is a b____ to the world.
（9）We must be in the same b____  to overcome the difficulty.
（10）Whether(是否) we'll go for a picnic d____  on the weather.

进行物理实验时，正确的操作是获取实验数据的前提，在“用电压表和电流表测小灯泡电阻”的实验中，下列操作中有问题的是（　　）