蒸熟的馒头松软多孔,是因为和面时加入了酵母菌,使面粉发酵产生的____气体遇热膨胀的缘故.
They will____ ____ to Beijing.
如图,△ABC与△CDA是全等三角形,则一定是一组对应边的是( )
—Who is the young man?
—A famous singer. Look! Hundreds of are waiting for him.
There is only a small b____ in my old school.
下列各项中,属于社会行为的是( )