汽车行驶时轮胎的胎压太高容易造成爆胎事故，太低又会造成耗油量上升．已知某型号轮胎能在﹣40℃～90℃正常工作，为使轮胎在此温度范围内工作时的最高胎压不超过3.5atm，最低胎压不低于1.6atm．设轮胎容积不变，气体视为理想气体，请计算和回答：

根据句意及首字母提示完成单词

① Paper can be r____. We'd better not throw it away.

② It is important to try to save e____.

③If we don't protect our e____, the earth will be destroyed.

④ Our teacher tells us to collect r____ plastic bags.

⑤ Gold, silver and iron are all m____.

对诗《望岳》赏析有误的一项是(    )。