Which of the following statements is NOT a fact about Alvin？
A. It can carry explorers as deep as 6．500 meters．
B. It has played a key role in various important undersea cxpeditions
C. It was launched in the sixties of the twentieth century．
D. It has been used for more than 40 years．
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The author predicts it will not________before a new technology is invented for music recording．
学生的知识不是靠教师的讲解获得，而是通过他自己的新旧知识相互：作用而生成建构的。这种学习理论是 （）
The weather is mild today：it is neither hot nor cold．
A. shy
B. watin
C. gentle
D. sweet
According to Paragraph 4,what does Rome plan to do？
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