It can be learned from the passage that__________．
A. Doris Lessing is Ms Lessing’s pen name
B. Doris May Tayler is the name of Ms Lessing’s birth place
C. Anna Wulf is Ms Lessing’s name used before
Doris May Tayler is Ms Lessing’s once used name
The best title for this passage is__________ ．
A. The Voices of Time
B. The Importance of Time
C. The Importance of．an Announcement
D. Time and Tide Wait for No Man
双子叶植物叶结构中，泡状细胞位于叶的上表皮，当叶片蒸腾失水过多时，泡状细胞变得松弛，使得叶子内卷和折叠而
分泌结构是植物体中能分泌特殊物质的细胞组合，根据分泌物是否排除体外，分泌结构被分为( )和( )两类。
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