理论上，金融期货价格有可能高于、等于相应的现货金融工具价格，但不可能低于相应的现货金融工具价格。（）
参考答案：错
Some students find certain grammar points and structures very difficult; _____, teachers need a reliable source of practice material to get these points across effectively.[ ]
A. however
B. as a result
C. even so
D. what’s more
《灵枢》中没有下列哪种瘤的记载( )
A．血瘤B．肠瘤C．筋瘤D．脊瘤E．肉瘤
