【单选题】According to the "economic growth stage theory" proposed by Walt w. ostow, the most important stage of economic development is ( ) of the economic development stage.
【简答题】Q1. How to protect ourselves from "Monsters'according to the video? Q2. Who is trying to invent new medicines to kill monsters? Q3. What is the name of the "monster" referred in the video? Q4.What are...