化石是研究人类起源的主要证据。如图是根据化石复原的原始人头像示意图，这种猿人曾经居住于现在的（    ）

存款准备金率是指金融机构为保证客户提取存款和资金清算的需要，而准备的在中央银行的存款。下图为我国大型金融机构一年来存款准备金率变化情况，在不考虑其他因素前提下，下列结论正确的是（      ）

①从M₁到M₂，股票价格指数会下跌    

②从M₁到M₂，社会物价水平会上升

③从M₃到M₄，企业贷款难度会降低    

④从M₃至M₄，货币的购买力会提高

    In our city there are more and more cars and buses on the roads. Many people drive to work .First, it's good to have a car. You needn't to wait for the bus. You can go to work on time. Then ,there are many busy roads in the city . Can you drive safely? Traffic lights are very important. You must look at the traffic lights and wait for the green man. If someone is crossing the road, you must stop your car and look carefully. We must follow the rules and stay safe on the road.

以下生态系统中，自动调节能力最强的是（　　）