如图的分子酷似企鹅，化学家 Chris Scotton将该分子以企鹅来取名为Penguinone。下列有关Penguinone的说法不正确的是      （   ）

A．Penguinone分子中有碳原子不可能都在同一个平面上

B．Penguinone的分子式为C₁₀H₁₄O，且能使溴水褪色

C．1 mol Penguinone完全燃烧消耗13 mol O₂

D．Penguinone的同分异构体中属于酚类只含有一个烃基侧链的物质共有4种

Some Chinese students have ____ English well.

A．difficulty in learning

B．difficulty to learn

C．difficulties learned

D．difficulties to learn