以下是从本单元课文中摘出的原句.试试看.能填上吗?要注意词形变化! 1．Today 42 countries that every summer, 3,000 scientists arrive to a variety of research projects． 2．Sometimes the scientists these changes dangerously their 题目和参考答案——青夏教育精英家教网—

题目内容

以下是从本单元课文中摘出的原句。试试看，能填上吗？要注意词形变化！

1．Today 42 countries ________ that every summer, 3,000 scientists arrive to ________ a variety of research projects．

2．Sometimes the scientists ________ these changes dangerously ________ their own research．

3．The map of Antarctica has changed shape over the last decades as huge chunks of ice ________ and ________ the sea．

4．American scientists are going to Antarctica ________ study the thin area as it develops．

答案：
解析：

　　1．have signed the treaty; carry out

　　2．studying; get involved into

　　3．have broken off; floated away into

　　4．in an attempt to

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