1. Some animals now often come to town to look for …
a) survival d) danger b) rubbish c) oxygen
2. Many rivers nowadays become … .
a) extinct c) polluted b) endangered d) reused
3. A lot of people will be thirsty if there isn’t enough … .
a) water c) food b) energy d) ecology
4. Tires, auto hoses, carpet padding are made of … .
a) cloth c) rubber b) paper d) metal
5. You should … a healthy and clean environment.
a) preserve c) reduce b) save d) try