سؤال ۲، زبان انگلیسی ۳، خرداد ۱۳۹۸

Which one is clean energy? Wind or Coal? ...... .

Scientists try to use clean energy because they ...... .a. do not pollute the earthb. are harmful to the environmentc. cannot be replacedd. cannot be turned into other forms of energy

When renewable energy is used, the demand for fossil fuels ...... .a. is producedb. is madec. is reducedd. is provided