已知豌豆的高茎对矮茎是显性，欲知一株高茎豌豆的遗传因子组成，最简便的办法是[ ]

A．让它与另一株纯种高茎豌豆杂交

B．让它与另一株杂种高茎豌豆杂交

C．让它与另一株矮茎豌豆杂交

D．让它进行自花传粉

"Town Hall is the tallest building in the city." "（）from here?"

A.Can it see

B.Can it be seen

C.Can see 

D.Can be seeing it