阅读判断。
Jim：Hi, Kate！What's the weather like in Shanghai today?
Kate：Hi, Jim！It's sunny and warm here. I'm going to the zoo this afternoon.
Jim：Sounds good.
Kate：Jim, how's the weather in Beijing now?
Jim：It's cloudy. It's going to rain. So I can't fly a kite in the park.
Kate：Oh, I see.
Jim：Do you know the weather in Guangdong?
Kate：It's too hot. The children there usually go swimming in the river.
Jim：Oh, I like swimming, too. But I can't swim now. It's cold here.
是圆心在原点的单位圆的两段圆弧，则不等式
的解集为（ ）