10. When did humans (appear) on the earth?相关知识点: 试题来源: 解析 10.appear 人类出现在地球上的时间取决于你所指的“人类”。最早的人类祖先,如南方古猿,生活在约420万到200万年前。而现代人类(智人)的出现则要晚得多,大约在20万到30万年前。因此,如果问题指的是现代人类,答案应该是大约20万到30...
A. that B. when C. where D. why 相关知识点: 试题来源: 解析 B。“when the first humans appeared on Earth”是对“mystery”的解释说明,“谜团是人类第一次出现在地球上是什么时候”,用“when”引导同位语从句,表示时间。反馈 收藏
aWhen when the earliest humans appeared on Earth, dinosaurs have been extinct for tens of thousands of years! People are discovered through fossil dinosaur. 当,当最早期的人在地球上出现,恐龙是绝种成千上万年! 人们通过化石恐龙被发现。[translate]...
aregola automaticamente 自动规则 [translate] aWhen the first humans appeared on earth, dinosaurs have been extinct for several million years!people through the discovery of fossil dinosaur. 当第一个人在地球上出现,恐龙是绝种几百万年! 人们通过在化石恐龙的发现上。 [translate] ...
Ever since humans lived on the earth,they have made use of various forms of communication.Generally,this expression of thoughts and feelings has been in the form of oral speech.When it is difficult to express withlanguage,communication is accomplished (完成) through sign language in which body ...
When did humans first appear on Earth? The first human ancestors appearedbetween five million and seven million years ago, probably when some apelike creatures in Africa began to walk habitually on two legs. They were flaking crude stone tools by 2.5 million years ago. Then some of them sprea...
7. A.考查名词.humans人类; animals动物;factories工厂;plants植物.根据上文"Carbon dioxide is a chemical in our atmosphere"和下文"Each person makes about 2.3 tons a year"可知,二氧化碳是我们的大气中的一种化学物质,但人类制造的太多了.每人每年大约制造2.3吨.故选A.8. B.考查形容词.useful有用的;bad...
Ever since humans have lived on the earth, they have made use of various forms of communication.Generally, this expression of thoughts and feelings has been in the form of oral speech.When there is a language barrier(障碍), communication is completed through sign language in which motions stand...
Many scientists believe modern humans first appeared in Africa. By 20,000 B.C., they had travelled and settled all over the world. They travelled farthest during 3 Ice Ages, when most seas were frozen, leaving bridges of dry land, 4 people could walk across. The first farmers on Earth ...
Ever since humans have lived on the earth, they have made use of various forms of communication.Generally, this expression of thoughts and feelings has been in the form of oral speech.When there is a language barrier(障碍), communication is completed through sign language in which motions stand...