4. The plants grew before the animals because they provide A. nutrients for animals to absorb(吸收) oxygen for animals to breathe C. necessary temperature for animals to keep warm D. water vapour for animals
4. The plants grew before the animals because they provide__________. A. nutrients for animals to absorb(吸收) B. oxygen for animals to breathe C. necessary temperature for animals to keep warm D. water vapour for animals
5. Which of the following statements is true? A. The dust settled into a solid globe between 4.5 and 3. 6 billion year ago. B. The first small plants began to appear on the surface of the land C. About 2.6 million years ago some small clever animals appeared and spread in the ocean Dinosaurs died out long before human beings developed on the earth
5. Which of the following statements is true? A. The dust settled into a solid globe between 4.5 and 3.6 billion year ago. B. The first small plants began to appear on the surface of the land. C. About 2.6 million years ago some small clever animals appeared and spread in the ocean. D. Dinosaurs died out long before human beings developed on the earth
Stage 1: The development of the earth (1)After the Big Bang, what happened? a cloud of dust
Stage 1: The development of the earth (1) After the Big Bang, what happened? a cloud of dust
(2 )What happened next exploded with a solid globe fire and rock
(2) What happened next? a solid globe exploded with fire and rock
(3)What did fire and rock produce? produced water vapour and gases
produced water vapour and gases (3) What did fire and rock produce?