下图表示两细胞间发生某种信息传递的过程。细胞Ⅰ、Ⅱ以及物质M、N的名称与图示含义相符的是(　　)

①胰岛A细胞、肝细胞、胰高血糖素、肝糖原　
②浆细胞、肺结核杆菌、抗体、抗原　
③甲状腺细胞、垂体细胞、甲状腺激素、受体　
④传出神经、传入神经、神经递质、受体

缩写句子

地球上发生过一次特大洪灾。

根据短文内容，选择最佳答案。

Scientists say life will be very different in 2050.First,there will be no TV channels (频道) . People will choose a programme (节目) from a computer and watch it on the television. We will get information on the computers only.

   Second, water will be a big problem. In many places, people won't have water to drink.

Third, cars will use new and clean fuels and they will go very fast. There will be a computer in every car. And computers will control the cars and there won't be any accidents (事故) .