题目内容
2、Exactly when the first people arrived in __1__ as California, no one really knows．
Scientists believe that these first setters crossed the Berlin Strait from Asia to Alaska __2__ of a land bridge．
Thousands were killed or __3__ slavery．__4__, many __5__ brought by Europeans．
Cloning has two __6__．Firstly, Secondly, it is valuable for research on __7__ and for medical research on animals．Many __8__ to clone mammals failed. But at last the __9__ of the scientists was rewarded in 1996 __10__— the cloning of Dolly the sheep．
试题答案
2、1．what we now know 2．by means of 3．forced into 4．In addition 5．died from 6．major uses 7．new plant species 8．attempts 9．determination and patience 10．with a breakthrough
Exactly when the first people arrived in __1__ as California, no one really knows．
Scientists believe that these first setters crossed the Berlin Strait from Asia to Alaska __2__ of a land bridge．
Thousands were killed or __3__ slavery．__4__, many __5__ brought by Europeans．
Cloning has two __6__．Firstly, Secondly, it is valuable for research on __7__ and for medical research on animals．Many __8__ to clone mammals failed. But at last the __9__ of the scientists was rewarded in 1996 __10__— the cloning of Dolly the sheep．
查看习题详情和答案>>Exactly when the first people arrived in __1__ as California, no one really knows．
Scientists believe that these first setters crossed the Berlin Strait from Asia to Alaska __2__ of a land bridge．
Thousands were killed or __3__ slavery．__4__, many __5__ brought by Europeans．
Cloning has two __6__．Firstly, … Secondly, it is valuable for research on __7__ and for medical research on animals．… Many __8__ to clone mammals failed. But at last the __9__ of the scientists was rewarded in 1996 __10__— the cloning of Dolly the sheep．
查看习题详情和答案>>课文填空
Exactly when the first people arrived in 1 as California, no one really knows．
Scientists believe that these first setters crossed the Berlin Strait from Asia to Alaska 2 of a land bridge．
Thousands were killed or 3 slavery． 4 , many 5 brought by Europeans．
Cloning has two 6 ．Firstly,…Secondly, it is valuable for research on 7 and for medical research on animals．…Many 8 to clone mammals failed．But at last the 9 of the scientists was rewarded in 1996 10 －the cloning of Dolly the sheep．