摘要: C.with引导的介宾短语常常用来表示人或物的外貌特征.
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| Choose the word or expression from the box to replace the underlined part in each sentence. (从方框内选择与划线部分意思最接近的单词或短语,用A,B,C…或G等表示。) | |
( )2.Do you know who invented the watch? ( )3.That woman can calculate numbers like lightening. ( )4.He is really a very tough guy and we are all afraid him. ( )5.Our English teacher is really very popular among us. We all like her so much. ( )6.We all know that we needn't wear trainers today. |
“辛烷值”用来表示汽油的质量,汽油中异辛烷的爆震程度最小,将其辛烷值标定为100,如图是异辛烷的球棍模型,则异辛烷的系统命名为( )

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| A.1,1,3,3-四甲基丁烷 | B.2,3,4-三甲基戊烷 |
| C.2,4,4-三甲基戊烷 | D.2,2,4-三甲基戊烷 |