注意首字母的大小寫(xiě),不含標(biāo)點(diǎn)符號(hào)
Everyone needs and uses energy. If there were no energy, ___1___.
Most of the energy on this planet comes from the sun, but people do not receive that energy directly. It ___2____.
Green plants convert the sun's energy to food energy that animals and people use for life.
there would be no life comes from different sources and in different forms