题海网，海量题库；找题库、找试卷、找答案就上题海网。

下列关于小磁针在磁场中静止时的指向，正确的是（   ）

为保护环境而提倡的低碳生活,是指生活中所耗用的能量要尽量减少,从而减少二氧化碳的排放量。下列各项属于低碳生活方式的是(　　)

①骑自行车或者步行上学　②农田秸秆焚烧处理

③少开空调、少吹风扇　④电脑始终处于开机状态

⑤少看电视,多户外运动

民国初年，一批文人改编京剧，在诗词歌赋等文本中选取题材，使剧词更文雅隽永，并参考昆曲、仕女画等文人艺术形式，发计了更为典雅的音乐、服饰、妆扮和舞蹈。京剧因此渐趋“雅化”，演变为具有严谨艺术准则和完整理论体系的剧种。这一变化（   ）

植物蒸腾作用的意义是(    )  

沙特阿拉伯的贝都因人，居住在帐篷，穿着宽大的袍子，过着游牧的生活，主要原因是（    ）

读图完成下列问题。

北京时间2021年3月20日17时9分（当地时间3月20日18时9 分），日本本州岛宫城县附近海域发生了7.0级地震。

读拼音写词语。

mì fēng	zhì huì	xiū jiàn	ōu zhōu
sū xǐng	zī shì	yún chèn	bǎo cún

已知f(x),g(x)都是定义在R上的函数，，，且(，且，．若数列的前n项和大于62，则n的最小值为（　　）

读我国区域饮食文化圈分布示意图，完成下列小题。

如图是动植物细胞亚显微结构模式图，请据图回答问题：

下列叙述随机事件的频率与概率的关系中，说法正确的是(　　)

阅读理解

    Indian-origin Anvitha Vijay has given a new meaning to the phrase “age is just a number”; she has proved that achievements and knowledge follow passion and not just age and experience.

    Vijay, who lives with her parents in Melbourne, Australia, at the age of seven realized that her piggy bank did not have enough money to hire a developer to make her an app, so she decided to teach herself how to code. With the help of YouTube videos, the young techie learned to code. For one entire year, she watched multiple coding tutorials on the web and became a programmer herself.

    Vijay's inspiration for developing the apps was her little sister, who was still learning to talk. Therefore, Vijay developed an educational app for children that were her sister's age. The app is called Smartkins, which uses about 100 sounds and flashcards of different animals that help children learn and identify. Later, Vijay developed a similar iOS app for children to identify and learn colors. Each app has been downloaded thousands of times.

    Anvitha's skills won her a scholarship to attend a big tech conference hosted by Apple in San Francisco, California. There, she got tips from the pros. She went to workshops where she learned about the latest software for app building.

    All that training led to an idea for a third app. This one, called GoalsHi, inspires kids to practice good habits. Users are rewarded for achieving goals, such as eating their vegetables or practicing piano. Anvitha says the rewards are like getting a sticker for a job well done.

    Anvitha's goal is to continue creating technology that helps kids learn while having fun. But even more important to her is that the world sees the power of technology in kids' hands. “The more training we get in tech at an early age,” she says, “the better chance we have of becoming creativity champions who will one day change the world.”

我在香港已经待了一个星期了。

I Hong Kong for a week.

模拟卫生间照明、换气电子控制电路如图甲所示。当卫生间门关闭且无人进入时，换气扇与照明灯均不工作；当有人进入卫生间，电路中继电器吸合，使继电器的两组常开触点J一1和J一2闭合，换气扇开始工作，照明灯亮起，且即使人进入卫生问关闭卫生间门后，换气扇与照明灯也不会马上关闭。其中NE555的引脚功能与内部电路分别如图乙与图丙所示。请根据电路图，完成以下任务：

抛掷一骰子，观察出现的点数，设事件A为“出现1点”，事件B为“出现2点”．已知P（A）=P（B）= ，则“出现1点或2点”的概率为（   ）

根据句义，在横线上填写适当的字，组成词语。

2019年9月1日播出的《开学第一课》以“______”为主题，为我们进行了一次感人至深的爱国主义教育。（    ）

如果在VB中输入代码Text1.Text=Rnd*10，Text1中得到的数据不可能是            。

加上偏旁，变成新字

文   员   同

阅读思考：

呼救信号————SOS 

利用电报传递信息事先要约好信号所代表的意义。美国画家缪尔·莫尔斯在1837年发明了电报后，又发明了一套电报信号的约定系统，这套系统被称之为莫尔斯电码。在莫尔斯电码中有一个表示紧急援助的信号：三短三长三短，即SOS。后来在许多场合都用作为紧急援助信号。例如，海上的船只遇到紧急情况需要援助，除了可用无线电报发出，也可以用灯光发出三短三长三短的信号，周围的船只见到后就会立即赶去援助。SOS信号也可以用敲击物体发出三短三长三短声音的方法来表示。1906年在柏林召开的国际会议上正式把SOS信号规定为国际统一的呼救信号。 

知道SOS信号的意义和发送SOS信号的方式后，我们就可以在需要的时候使用它。例如，我们一量遇到紧急情况就可以用三短三长三短的声音或灯光向他人求助；或者我们听到或看到三短三长三短的信号，那就应该想到有人在紧急求助，应当在一方面立即向有关部门报告，一方面尽自己的能力给予帮助。 

读后思考：

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