bài 1 : Hãy chọn đáp án đúng 
1) Somene's carbon................is a measure of the camount of carbon diocive that their activities produce.
A)effect               B)amount                   C)footprint                      D)energy
2) Wave energy is a source of ...................... energy.
A)enviromental                  B)environmentally friendly                     C)environment friendly                   D)enviromental friendliness
3) A lot of cultural and......................activities are held as part of the Flower Festival in Da Lat.
A)arts                       B)artistic                          C)artist                   D)art
4) People in.....................areas have to gather wood to use as fuel.
A)rural                   B)moutainous                         C)urban                               D)highland