问题
单项选择题
对技术的传统举例斧头的形状保持不变的科学史家是（）
A、海尔蒙特
B、贝尔纳
C、舍勒
D、卡文迪西
答案
参考答案：B
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对技术的传统举例斧头的形状保持不变的科学史家是（）
A、海尔蒙特
B、贝尔纳
C、舍勒
D、卡文迪西
参考答案：B
Natural resources are things that we use that come from Earth. Out natural resources are limited（有限的）. This means that they will not forever. Some are renewable, like when you plant a new tree when you one down. Others are not renewable, like when you dig coal（煤）out of the . Once it is used, it is gone.People realize the that Earth’s natural resources are limited, and can do things to help conserve（节约）those resources. you try to conserve a natural resource, you try to use less of it, so it does not get used up so . One way that people conserve fuel, like gasoline, is by riding a bicycle or walking when the is short instead of driving everywhere.Water is a very important natural resource because we all need it to stay . We can conserve water making sure that our pipes and taps do not leak（漏）. We can also make choices to conserve water, like only using the dishwasher or washing machine when theyare full. Everyone can make contributions to protecting natural resources.
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