The word carbon (Para. 2, Line 3) stands for" ______".
A. intelligent robots
B. a chemical element
C. an organic substance
D. human beings
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《合同法》规定，如果承诺改变了要约的非实质性内容，要约人未及时表示反对，应认为合同已经成立。这充分体现了合同法的( )
A. 合法原则
B. 合同自由原则
C. 诚实信用原则
D. 鼓励交易原则
The statement "In my fridgeless fifties Childhood, I was fed well and healthily." (Para. 2, Line 1 ) suggests that ______.
A. the author was well-fed and healthy even without a fridge in his fifties
B. the author was not accustomed to use fridges even in his fifties
C. there was no fridge in the author's home in the 1950s
D. the fridge was in its early stage of development in the 1950s
在超文本中插入视频剪辑文件sample4.avi，鼠标移到AVI播放区域上时，才开始播放AVI。实现这一功能正确的HTML程序为（）
A. ＜IMG dynsrc＝"sample4.htm" start＝fileopen＞
B. ＜IMG dynsrc＝"sample4.gif" start＝fileopen＞
C. ＜IMG dynsrc＝"sample4.avi" start＝mouseover＞
D. ＜IMG dynsrc＝"sample4.gif" start＝mouseover＞
In Paragraph 1, the word "skeptical" means（）
A. doubtful
B. worried
C. sad
D. angry
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