在区间﹣ $\frac{\pi }{2}$ ， $\frac{\pi }{2}$ 上随机取一个数x，则事件“0≤sinx≤1”发生的概率为（  ）

    Canada Geese are large blue and white birds. When autumn comes, they have to fly south where the weather is warmer. The winters are so cold in Canada that the birds will die if they stay there.

    Last spring, Bill Lishman found sixteen young Canada Geese on his farm. They had lost their parents. Bill thought, “These young birds won't know what to do in the autumn.” He had a small plane and he decided to teach the birds to fly by following him. All through the summer, he went on short trips in his plane and the young geese flew after him.

    When the cold weather arrived in the autumn, Bill flew to Virginia in the United States------600 miles South of his home in Canada. The geese followed him all the way. Bill left the geese in Virginia and he returned home.

    This spring, Bill was waiting for the birds to come back. They didn't arrive, so Bill flew to Virginia to get them. He looked for them for two weeks but he couldn't find them. When he arrived back home, he found the geese waiting for him. They had found their way home without him!

( No more than 4 words)

在双缝干涉实验中，由双缝S₁、S₂发出的光在光屏上某点P叠加，若光的波长为600nm，光屏上P点到S₁、S₂的距离分别为3.2×10^-2mm和1.1×10^-2mm，则P点将出现____ (选填“亮”或“暗”)条纹。

倒：dǎo____  dào____    处：chǔ____  chù____     行：xíng____ háng____