冬虫夏草虫体有足8对，其中（）
A.头部三对最明显
B.中部四对最明显
C.头部四对最明显
D.中部三对最明显
参考答案：B
A fool has gained nothing from the time _____, for he _____ nothing. [ ]
A. passing; has paid
B. passed; has been paid
C. passing; has been paid
D. passed; has paid
叶片中进行光合作用的场所是（ ）
A．叶绿素
B．叶绿体
C．叶肉细胞
D．保卫细胞
