Вопрос из теста по предмету Английский язык

Question

Определите основную идею текста

Answer

Solar cells are being used in many ways and may in the future be an answer to power shortage problems.

Answer

The perspective that they will be used in the future is very slight, since they take up too much space.

Answer

The material requirements for covering one percent of the Earth's surface with solar panels would be enormous but realistic.

Answer

Solar cell is the cheapest source of electrical energy.

Определите основную идею текста: ответ на тест 804739 - Английский язык