已知果蝇控制眼色的基因在X染色体上，红对白为显性。在下列哪组杂交组合中，通过眼色就可直接判断子代果蝇的性别？ [ ]

A．白眼(♀)×红眼(♂)

B．杂合红眼(♀)×红眼(♂)

C．白眼(♀)×白眼(♂)

D．杂合红眼(♀)×白眼(♂)

The soldiers planned to _____ the bridge but had to give up because a storm ____.

A．blow up, blew away

B．blow down, blew up

C．blow up, blew up

D．blow down, blew away