4 为了减少汽车尾气排放，鼓励绿色出行，某城市投放了一批共享单车和共享电动车.已知3辆共享单车和2辆共享电动车一天的租赁收入共44元，2辆共享单车和3辆共享电动车一天的租赁收入共46元.求一辆共享单车和一辆共享电动车一天的租赁收入各是多少元.

一辆共享单车一天的租赁收入是8元,一辆共享电动车一天的租赁收入是10元.

1 Choose the best answer.(选择最恰当的答案)
() (1) We should try our best to waste.
A. reducing B. increasing C. increase D. reduce
() (2) It’s important to the environment.
A. protect B. protecting C. protection D. protected
() (3) We can save water by the tap when we brush our teeth.
A. turn on B. turning off C. turn off D. turning on
() (4) Not plastic bags is a good way to protect the environment.
A. use B. used C. using D. uses
() (5) We should plant more trees because they can carbon dioxide(二氧化碳).
A. take in B. take out C. put in D. put out

(1) D (2) A (3) B (4) C (5) A

2° Read and write.(根据提示,写出/补全单词)
(1) We should r waste paper to save trees.
(2) It's our duty to keep our e clean.
(3) People use too many p bags. They are bad for the environment.
(4) We can go to school by bike instead of by car to reduce air (污染).
(5) Let's work together to make our city more (美丽的) and cleaner.

(1) recycle/reuse (2) environment (3) plastic (4) pollution (5) beautiful