( )系指药物的转运速度在任何时间都是恒定的，与血药浓度无关 A．活化过程

Spring is coming . The flowers will start blossoming (开花)and the trees will be filled with colors. It’s time of the year for people to plant trees. Planting trees is a good way to protect our environment. But most of us don’t have a place to plant trees. So what can we do for protecting the environment? We can make a difference from the others. For example, we can think about a way to make people cut down fewer trees. As we know, paper is made from trees. If we use less paper, we can save a lot of trees. Then we may have a problem that how to use less paper. Let me tell you my ideas.
Reducing Our Paper Waste Every day we just use the paper and we don’t think about where the paper comes from.Let us think about wasting a piece of paper is like wasting a tree. We can start with reducing the amount of paper products that we use. This could be done by such a simple way as using e-mail instead of writing notes.	Reusing We could reuse paper that is clean on one side for drafts, notes and even photocopies. As students, we could reuse paper by doing our research online or at libraries rather than buying lots of written paper. Sharing books or buying a used textbook for school is another way of reusing.	Recycle We should consider recycling notebook paper, newspapers, magazines and colored paper. We can buy paper towels, tissues, and toilet paper that have been made from recycled paper. Don’t throw away the wasted newspapers or books which are not useful to you.

小题1:People can protect the environment by doing the following things except ______.

A．planting trees	B．reusing paper
C．drinking less water	D．cutting down less trees

小题2:We can reduce our paper waste by______.

A．sending e-mail

B．writing letters

C．sending cards

D．using paper bag

小题3:______isn’t a way for you to reuse paper.

A．Doing research online	B．Buying lots of written paper
C．Sharing books	D．Buying a used textbook

小题4:______can be recycled to make paper towels, tissues and toilet paper.

A．Colored paper	B．Newspapers
C．Magazines	D．All of the above

小题5:From the passage we know that      .

A．we can reuse paper for drafts, notes and even photocopies

B．the paper is made from clothes and trees

C．four ideas are mentioned here to save paper.

D．we should cut down more trees to make more paper