Unit4 Astronomy: the science of star-Warming up & Reading教案
a. insects and amphibians appear b.reptiles appearc.shellfish and other fish appear d.dinosaurs appeare.small plants grow on the water f.plants begin to grow on dry landg.mammals(including humans) appear 5.water 6.______ 7._______ 8._______ 9.______ 10.______ 11.______12.______ task3:careful-reading1. why the earth was different after the water appeared?2. why did plants grow before animals?3. why did animals first appear in the sea not on the land?4. what is the main difference between reptiles and mammals? can you give some examples of mammals?step four: cooperative learningdisscuss the following questions, and use para4 to help you.1. why do people become the most important animals on the planet?2. do people take care of the earth? what are they doing to the planet?3. what is the result?step four: discuss for moral education• why did dinosaurs die out?• do you think there will be a sudden change of weather on the earth?• what should people do to protect our earth?e for evaluation:after the “big ban”, the earth was just a cloud of __________dust. it ________ loudly with fire and rocks, which were________ to produce the water vapour, ________ and other gases. then small lants grew. they ________ and filled the oceans and seas with oxygen. many millions of years later, the first gren plants began to ________ on land. when the plants grew into forests, ________ appeared for the first time.they produced young generally by ________ eggs. when dinosaurs disappeared, ________became more important. now small clever animals with ________ appeared and __________ all over the world. as time went by they covered the earth and they are putting too much carbon dioxide into the ________, which________ heat ________ escaping from the earth into space. whether life will continue on earth for millions of years to come will ________ whether this problem can be solved.