A:even though
B:as if
C:so that
D:now that
下列说法中,正确的是( )
What’s this in _____ English?
将烧瓶内的水加热至沸腾后移去火焰,水会停止沸腾.迅速塞上瓶塞,把烧瓶倒置并向瓶底浇冷水(如图),你会观察到烧瓶内的水又沸腾起来,产生这一现象的原因是( )
______ birds use their feathers for flight, some of their feathers are for other purposes.