A:北方常规能源缺乏
B:南方土地资源紧张
C:西部光热资源不足
D:东部矿产资源缺乏
下列各项试图论述用鼻呼吸的优点,但有一项不正确,应该是( )
Chen Wei isn't at school today ________ he is taking a robot competition in Shanghai.