读短文，判断正(T)误(F)。

      Guangzhou is a beautiful city. It's not cold in winter (冬天). We can wear jackets. It's hot in summer. We

often swim in the swimming pool (游泳池). We can see many tall buildings in Guangzhou. There are many

flowers and trees everywhere. There are many cars on the road. There are many big parks, too. The air is fresh

in the park. Many people come here on the weekends. It's a nice place.

( ) 1. Guangzhou is a small city.

( ) 2. We often wear jackets in winter.

( ) 3. There are many tall buildings in Guangzhou.

( ) 4. We often swim in the river.

( ) 5. There are many people in the park on Saturdays and Sundays.

下列属于集合概念的是( )

A．老年人

B．残疾人

C．国家

D．国际奥委会