Which one of the following relationships can describe the relationships in poppy, opium and morphine ( ) A: Plant - crude extract - purified compound B: Crude extract -plant - purified compound C: Purified compound -plant -crude extract D: Purified compound- crude extract -plant

Which book is the article extract from?

According to ___, children extract generalizations from language they hear.

电子舱发生烟雾，按压BLOWER和EXTRACT按钮后，会产生什么现象？ A: 客舱风扇、BLOWER风扇停转、EXTRACT风扇仍然运转、出口活门打开一定角度 B: 客舱风扇、BLOWE C: EXTRACT风扇均停转、出口活门打开一定角度 D: 客舱风扇停转而BLOWE E: EXTRACT风扇仍运转、出口活门打开一定角度

a famous person A: adverse B: extract C: illiterate D: celebrity

15. With an intensive training of five months, this course aims to develop the reading skills to extract information ___ texts.

Beef extract peptone medium is used for culture (). A: Yeast B: Mold C: Bacteria D: Actinomycetes

词根tract的语义是to draw，retract、subtract、extract、distract的词义分别是（）。

检索有关extraction、extract、extracting、extracted的英文文献，以下最合适的截词为（ ）。

雨课堂: 语法判断 4. The next step is to deeply analyzed malicious time intervals to extract attack flows.