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读短文，判断正(T)误(F)。

      My name is Jie. I live in Beijing. My brother Xiao likes summer. Because he can swim in the lake and eat

ice cream. But I don't like summer. It's too hot. I like spring. It's warm. I can plant trees. My parents like fall.

Because their birthdays are in September and October. On the weekends, we usually visit my grandparents.

Sometimes we go hiking and climb mountains. We have a happy family!

( ) 1. Jie likes spring.

( ) 2. Xiao doesn't like summer.

( ) 3. Jie's mother's birthday is in fall.

( ) 4. They usually go hiking on the weekends.

( ) 5. There are three people in Jie's family.

( ) 6. Jie lives in China.

若U={x|x是三角形}，P={x|x是直角三角形}则∁_UP=（　　）

A．{x|x是直角三角形}

B．{x|x是锐角三角形}

C．{x|x是钝角三角形}

D．{x|x是钝角三角形或锐角三角形}

设N_A表示阿伏伽德罗常数的值，下列说法正确的是（　　）

A．18gH₂¹⁸O中所含的中子数目为12N_A

B．2.24L氦气中所含的原子数目为N_A

C．4.4gCO₂中所含的共价键数目为0.2N_A

D．0.1mol羟基中所含的电子数目为0.9N_A

下列说法中，不正确的是（　　）

A．A

B．B

C．C

D．D

现场对婴儿进行心肺复苏时，按压和吹气的比例为多少？