阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

    One day, Daisy dreamed a strange dream. She flew in a wonderful carpet to talk with an antelope in Tibet. The antelope told her they were hunted because of their fur which can be used to make sweaters like hers.

Later, she flew to Zimbabwe where she talked with an elephant and got to know the farmers there no longer hunted them. That's because the government decided to help and the farmers finally made a lot of money.

    At last, she arrived at the thick rainforest where a monkey told her “no rain forest, no animals and no drugs.” Although finally everything was gone, she had learned so much.

2016年是我国“十三五”开局之年，对2016年前三季度经济发展的信息解读正确的是（  ）

①经济保持中高速增长                ②经济结构不断优化升级

③已高水平全面建成小康社会    ④科技创新对经济推动作用明显

下列说法中正确的是（　　）

关于声音，下列说法正确的是（　　）