航空摄影航模除电视台现场直播盛事外,还有哪些用途()①救难;②特工监视活动;③警方追

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问题:

航空摄影航模除电视台现场直播盛事外,还有哪些用途()①救难;②特工监视活动;③警方追踪;④模型飞机娱乐;⑤挑战

A.①④⑤

B.②③④

C.①②③④⑤

考点:无人机AOPA驾驶证考试无人机培训综合练习无人机培训综合练习题库
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一项工程甲单独做12天可以完成,如果甲单独做3天,余下的工作由乙去做,乙再用6天可以做完,若甲单独做6天,余下的工作乙要做几天?

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R酶(核酸质酶)(ribozyme)

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阅读理解。

                                                        Tragedy at the Circus

     In yesterday's circus (马戏团) show, a tiger suddenly attacked its trainer and had to be shot dead.

As the circus packed up and left, circus officials said the show would go on, even without tigers.

     However, the officials can't simply turn a blind eye to the ethical problems left behind. Even before

this tragedy (悲剧), animal rights activists protested against keeping wild animals in unnatural conditions

and forcing them to suffer for the profit (利润) of circus organizers.

      It is now time for us to take effective steps to make sure that circus animals are treated properly.

     Circus Safe for Animals

     Our circus recently suffered a most tragic event in its history. While we are thankful for the pity from

the public, we are also astonished by the opinion expressed in "Tragedy at the Circus."

     First, our performing animals are not taken from the wild. As to the ethical problems. we always believe

humans and animals can-and should-live together nicely. To us, the performing animals are representatives

of their species (物种), and our circus is one of the only places left willing to support this special role of

performing animals in the existence of the species. Those who argue that circus life is harmful to animals

show little knowledge of these facts. Life in the "wild" is unsafe, but a continuous struggle for existence.

To overlook these reslities is the greatest fault against the animal kingdom.

     This circus has proven that animals are stronger and smarter than we could imagine. Within the circus

is a joyful atmosphere for both animals and humans: people are educated, and species saved.

1. What is the main purpose of the first passage?

A. To show pity for the performing animals.

B. To express worries about ainimal trainers'safety.

C. To deal with the difficult situations of the circus.

D. To call for action to protect circus animals.

2. What will the circus most probably do?

A. Take no notice of the tragedy.

B. Continue its performances.

C. Use fewer wild animals.

D. Limit its profit.

3. What does the circus think of its performing animals?

A. They are as clever as human beings.

B. They struggle continuously with human beings for existence.

C. They are helpful in saving their species.

D. They have equally natural living conditions as wild animals.

4. What is the most probable relationship between the two passages?

A. A public request and a newspaper report.

B. A newspaper article and a reply to it.

C. Two parts of a newspaper article.

D. Two newspaper reports.

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下面是一位教师执教函数奇偶性及课后交流时的实录。阅读下面材料,分析其中存在的问题。师:同学们,今天我们学习函数的奇偶性,它是非常重要的函数的性质,在高考中经常被考查,我先给出函数奇偶性的定义。(教师边板书,边讲解定义)师:从定义可以得到判断奇偶性的方法和步骤……下面我们讲例题。(以上的分析讲解不到6分钟,教师接着讲了三种类型的问题:判断、证明函数的奇偶性以及简单应用。接着就是学生的练习,教师的点评。在例题讲解、练习与分析的过程申,学生也积极地参与交流、踊跃发言)课后评课时,上课的老师自信地说,自己十分重视学生的活动,例题讲解清楚,问题分析到位,过程书写规范,充分保障练习,学生在考试时定能考出好成绩。当听课老师提出教学中对函数奇偶性概念建立过程没有很好地展开时,执教教师说:概念就是规定,让学生记住是主要的,没有什么好讲的,有时讲与不讲效果差不多,这样也是为了节省出更多的时间来解题。上述观点也得到了不少教师的赞同。

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爆炸做功的基本原理是什么?

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