—________ great fun we had at the party last night!
—Yes, it was so exciting that everyone was happy.
A:How a
B:How
C:What
D:What a
下图1表示夏天某一晴天一昼夜中某棉花植株CO2的吸收和释放曲线;图2表示该棉花叶肉细胞两种细胞器的四种生理活动状态。则图1中时间a、b、c、d依次发生了图2所示的哪项生理活动( )
m=-2是直线2-mx+my+3=0与直线x-my-3=0垂直的( )
Listening to music at home is one thing, going to hear it live is quite another.
关于新疆地形分布的叙述,下列说法正确的是( )