In 1986, the ______ changed its name to World Wide Fund for Nature to better reflect its activities. (organize)
A.
B.
C.
D.

________of oil will lead to the depletion of this natural resource.(exploit)
A.
B.
C.
D.

Noise pollution can cause stress and ______ and health problems for human.(psychology)
A.
B.
C.
D.

The air / many areas / so unclean that / people / have to / masks / going / streets
A.
B.
C.
D.

Industrial factories / throw / air / huge amounts / pollutant gases
A.
B.
C.
D.

Smoke / aircrafts / factory chimneys / bonfires / different kinds of vehicles / streets / many / other factors / damage / clean air / every day
A.
B.
C.
D.

One / biggest environmental impacts of human activities / air pollution
A.
B.
C.
D.

The trees in this area were                    off for crops and the construction of public facilities.
A.
B.
C.
D.

The trees in this area were                    off for crops and the construction of public facilities.
A.
B.
C.
D.

To                means to set up or initiate.
A.
B.
C.
D.