一、 1、an art and science fair
2、environmental protection
3、a model plane
4、a beautiful painting
5、be made of/from...
6、be known/famous for...
7、 as far as I know
8、 by hand
二、1、chopsticks
2、produce
3、widely
4、environmental
5、grass
6、leaves
7、forks
三、1、C
2、B
3、B
4、B
5、D
四、1、What is
2、Where do
3、 Is it
4、are caused by
五、1、is/was made of
2、by hand; sent for processing
3、all over the world
4、 both health and business
5、on the sides of mountains
六、1、noisy
2、workers
3、 also
4、 reported
5、better
6、in
7、does
8、uncomfortable
9、them
10、trying
七、1、T
2、F
3、T
4、T
5、F