光合作用的原料是( )
A.氧气
B.阳光
C.二氧化碳和水
D.有机物
答案:C
You can usually find these signs along the road except ______. [ ]
A.
B.
C.
D.
It is believed that this book is _______ worth reading than that one.
A.more
B.better
C.quite
D.most