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【判断题】
磁感应线是无头无尾的闭合曲线。A.
正确
B.
错误
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举一反三
【单选题】下列关于视紫红质的描述,哪项是错误的 ( )
A.
对光很敏感
B.
合成、分解为可逆反应
C.
血中维生素Ａ缺乏,合成减少
D.
为视蛋白与视黄醛的结合物
E.
为视锥细胞的感光色素
【单选题】Americans usually ______ to show they are full at the dinner table.
A.
point to their throat
B.
break eye contact
C.
pat their stomach
D.
change their posture
【单选题】When you are writing an essay that show process, you usually use tense, voice.
A.
present;active
B.
present;passive
C.
past;active
D.
past;passive
【简答题】Mariah Evans at the University of Nevada, Reno, led a 20-year study which asked s in 27 countries to tell the number of books that were in their home while they were growing up. Their answers sho...
【简答题】Gifts are usually given during special holidays, or on occasions to show thanks for special (invite).
【简答题】阅读理解。 Important people often like to show how important they are. They usually have the most comfortable cars, live in the biggest houses, wear the most expensive clothes, and eat in the best rest...
【简答题】阅读理解。 Mariah Evans at the University of Nevada, Reno, led a 20-year study which asked s in 27 countries to tell the number of books that were in their home while they were growing up. Their answe...
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