某酯水解生成甲和乙两种物质，在同温同压下，相同质量的甲和乙的蒸气占有相同的体积，则该酯的结构简式为（ ）．
某酯水解生成甲和乙两种物质，在同温同压下，相同质量的甲和乙的蒸气占有相同的体积，则该酯的结构简式为（ ）．
应选
The manager said that there were two reasons _____ our sales dropped sharply last year.
The manager said that there were two reasons \_\_\_\__ our sales dropped sharply last year.
要求放大电路取用信号源的电流小，而且输出电压稳定，应选（ ）负反馈。
要求放大电路取用信号源的电流小，而且输出电压稳定，应选（ ）负反馈。C
The lecture was so_____ that everyone went to sleep.
The lecture was so\_\_\_\__ that everyone went to sleep.
依次填入下面横线处的语句，顺序最恰当的一项是（ ）山里的樱花____，远远望去，有娇羞地____，也有____，更多的则是____，独自盛开，和周围的青山、树木、杂草，以及那些不知名的小花____。
依次填入下面横线处的语句，顺序最恰当的一项是（ ）山里的樱花\_\_\_\_，远远望去，有娇羞地\_\_\_\_，也有\_\_\_\_，更多的则是\_\_\_\_，独自盛开，和周围的青山、树木、杂草，以及那些不知名的小花\_\_\_\_。
A person who gets the basic necessities must _____ according to the writer.
A person who gets the basic necessities must \_\_\_\__ according to the writer.