2、rsystem. 5.Theylookedfortheirpeteverywhere,buttheydidn’t find it. Ⅱ.根据汉语意思完成句子,每空一词1.他们刚刚在火星着陆了。They have just landed onMars. 2.星期六是按土星的名字命名的。Saturday is named after theplanetSaturn. 3.他们已经把信息发回地球了。Theyhavealready sent messages back totheearth. 4.我们在山里发现了很多其他动物。Wehave found many
3、 other animalsinthemountains. 5.地球上的人类还没有到过太阳系的其他行星。Nomanontheearth has reached otherplanetsinsolarsystem. Ⅲ.根据句意用所给词的适当形式填空1.Noone hasbeen (be)toMarsyet. 2.Sofar,modernscientists havediscovered (discover)100millionsuchgalaxies. 3.It’stimeforclass,butTom hasn’tappeared (notappear)y