长期以来,中国主要以化石能源为主,而化石能源中更是以()为主
参考答案:煤炭
小张和小王分别驾车沿平直公路同向行驶,在某段时间内两车的v-t图象如右图所示,初始时,小张在小王前方x0处( )
A.若x0=18 m,两车相遇1次
B.若x0<18 m,两车相遇2次
C.若x0=36 m,两车相遇1次
D.若x0=54 m,两车相遇1次
These wild flowers are so special that I would do ____ I can to save them.[ ]
A. as many as
B. that
C. as much as
D. whichever