观察图，第二次世界大战后经济发展呈现这一特点的国家是（    ）

阅读理解

B

      A father sat at his desk thinking of his poor family life when his young son ran in and said happily, “Dad, because this is your birthday and you’re 50 years old, I’m going to give you 50 kisses, one for each year!” But the father said, “Oh, Andrew, don’t do it now. I’m too busy!” Hearing this, the boy said nothing as tears (眼泪) ran down in his big blue eyes. The father felt sorry for his son, and then he said, “You can finish later.”

      The boy walked away, with disappointment on his face. That evening the father said, “Come and finish the kisses now, Andrew!” But the boy didn’t answer.

      Unluckily, a few days later, the boy had an accident (事故) and left his father forever.

      Love is a two-way street. We must warmly accept (接受) any loving act, or we will feel sorry.

将稀盐酸慢慢滴入装有氢氧化钠溶液的烧杯中，用温度计测出烧杯中溶液的温度，溶液温度随加入稀盐酸的质量而变化如图所示，则下列说法错误的是（    ）

已知$0<\alpha <\beta <\gamma <\frac{\pi }{2}$  ，求证：$\sin \alpha \cos \beta +\sin \beta \cos \gamma +\sin \gamma \cos \alpha >\frac{1}{2}(\sin 2\alpha +\sin 2\beta +\sin 2\gamma )$ .

A（3，﹣1）关于原点O的对称点B的坐标是____ ．