سؤال ۶، زبان انگلیسی ۳، دی ۱۳۹۷

با استفاده از کلمات داده شده متن زیر را کامل کنید.(یک کلمه اضافی است.)generate, renewable, convert, turbine, effectEngineers design and make machines that measure wind and ......17...... wind into energy. They develop wind turbines that ......18...... electricity by considering the Earth’s surface, wind direction, average outside temperature, the ......19...... by and on birds and insects, and the great forces on the ......20...... .