大众希望的技术进步，既要方便也要实惠。顺应这种要求，我国已开始布局5G技术研发。相比4G每秒100MB的峰值速度，5G理论值将达到每秒10GB。这表明（    ）

①商品是使用价值和价值的统一

②消费意愿是物质生产的前提和基础

③消费可以引导生产的调整和升级

④科技含量高低决定了商品价值大小

   A pretty, well-dressed young lady stopped a taxi in a big square, and said to the driver, “Can you see that young man at the other side of the square?”
   “Yes,” said the taxi-driver. The young man was standing outside a restaurant and looking impatiently at his watch every few seconds.
   “Take me over there.” said the young lady.
   There were a lot of cars and buses and trucks in the square, so the taxi- driver asked, “Are you afraid to cross the street.”
   ‘Oh, no !” said the young lady. “But I said that I would meet that young man for dinner at one o’c1ock, and it is now a quarter to two. If I arrive in a taxi, it will at least seem as if I have tried not to be too late.”

下图表示在细胞分裂过程中，细胞内染色体的变化曲线，下列相关的叙述中正确的是(　  )