题目内容

蓝藻藻殖段的产生是由于在藻丝上具有异形胞和厚壁孢子而形成的。

A. 对
B. 错

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蓝藻的繁殖方法在藻类中最简单,没有有性生殖,也没有具鞭毛的生殖细胞。

A. 对
B. 错

伪空泡是某些绿藻细胞内特有的气泡,可调节细胞的浮力,使植物体上浮。

A. 对
B. 错

Who is a hero these days? In the past, the word hero was reserved for those who have performed _____1____ courage to help beyond the call of duty. An excellent example of such a hero may be found in a soldier who runs through gunfire to save his military ____2_____ from death or in a larger-than-life leader like Nelson Mandela who, after 27-year imprisonment, still believed deeply in his commitment to the _____3____ and reconciliation in his country.Today, the same word hero has become more common and is applied to both the ___4_____ and ____5______of various difficulties and tragedies. Average ____6____ become heroes for having acted instinctively beyond the call of duty with courage and ____7____ in extraordinary circumstances. First responders, like firefighters and police officers, are also counted as heroes despite that they are ____8_____their duty. We recognize them not because of what they make happen but because of their remarkable spirit and love of ____9______ to rush toward danger to help.Inspired by heroes, we should not only honor them, but strive to change the ____10____ that may cause their loss. And more importantly, we should take a leaf out of their book when circumstances call on us.

平喘作用最强的是

A. 克仑特罗
B. 特布他林
C. 沙丁胺醇
D. 异丙肾上腺素
E. 麻黄碱

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