如图，等腰直角三角形ABC中，∠ACB=90°，在斜边AB上取两点M、N，使∠MCN=45°，设MN=x，BN=n，AM=m，则以x、m、n为边的三角形的形状为（　　）

I like (在牛奶里加蜂蜜); it gives the milk a special taste.(add)

他说的话与我们正在讨论的问题不相关。

What he has said the problem we are discussing.

某微粒的结构示意图为 ，它表示（   ）

阅读下面文本，完成下列问题。

采薇

采薇采薇，薇亦作止。曰归曰归，岁亦莫止。

靡室靡家，玁狁之故。不遑启居，玁狁之故。

采薇采薇，薇亦柔止。曰归曰归，心亦忧止。

忧心烈烈，载饥载渴。我戍未定，靡使归聘。

采薇采薇，薇亦刚止，曰归曰归，岁亦阳止。

王事靡盬，不遑启处。忧心孔疚，我行不来。

彼尔维何？维常之华。彼路斯何？君子之车。

戎车既驾，四牡业业。岂敢定居？一月三捷。

驾彼四牡，四牡睽睽。君子所依，小人所腓。

四牡翼翼，象弭鱼服。岂不日戒？玁狁孔棘！

昔我往矣，杨柳依依。今我来思，雨雪霏霏。

行道迟迟，载渴载饥。我心伤悲，莫知我哀！

下列各组中互为同位素的是（   ）

将下面句子填写完整。

阅读理解

Warley Woods Community (社区) Trust

    Welcome to our third newsletter of the year!

    Our main activity for March is our Walk for the Woods fundraising event on Saturday, 17th March, starting any time between 10 a. m. and 2 p. m. We will be walking the distance between Warley Woods and Tipperary. It is indeed a long way—80 miles. The more people that you can get to sponsor you, the more money we can raise to help look after our beautiful woodland. More information is available on our website.

    The Sunday volunteers planted two beeches and an oak last week. This was thanks to the money from the Big Tree Plant and to Lisa and Gordon Whitaker, whose friends gave money for the big trees instead of for their wedding presents. Thanks to everyone who took part.

    There were 15 volunteers at the Oral History Training Day which was led very ably by Julia Letts. The group will be meeting again and will start to interview the local people who have offered to tell their stories. We are happy to hear from others who would like to be interviewed about their memories of the Woods for the project. If you or anyone you know is interested, please call Viv Cole at the office. This project is financed by Heritage Lottery Fund.

    There was a huge response to the Forest School activities held at half term. These will be held again during the Easter holidays on the following dates:4th April from 10 a. m.  to 3 p. m.  for over 8s. On 12th April form 10 a. m.  to 12 noon, there will be a Teddy Bears' Picnic for the under 8s. All these must be booked in advance.

    Finally, don't forget the Easter Egg Roll on Bank Holiday, 9th April, starting at 11 a. m.  Bring your own hard-boiled and decorated egg to roll down the hill in the woods. The first past the finishing line will win a large chocolate egg! This year, due to popular demand, there will also be an Adults' Easter Egg Roll following the children's competition.

    We look forward to seeing you all soon, at one of our many events!

将等物质的量的乙烷和溴蒸气混合后，在光照条件下充分反应，所得产物中物质的量最大的是（   ）

—Would you mind if the window was closed?

—________. I also feel a little cold.

单句改错

工业上由氨合成硝酸并进一步制取化肥硝酸铵。工业上制备硝酸的流程如图所示。由图可知，根据绿色化学要求，生产中采用循环操作，理论上使氨气完全转化为硝酸。已知实际生产中：氨合成硝酸时，由NH₃制NO的产率为94%，NO制HNO₃的转化率为90%。氨与硝酸反应生成硝酸铵的转化率为94%。计算：

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。

    Although most people believe that formal schooling is required for scientific success, a college degree is not always necessary.excellent example of a man who won fame as a scientist academic(学术的) training is Vincent J. Schaefer. His formal education ended two years of high school when he had to go to work in an untrained job at General Electric. Because his inventive mind and his skill as a model maker, he was soon allowed to try his own experiments in the company laboratory. His natural (curious) made him wonder about clouds. He developed, after many tries, a method of making clouds rain they would not normally do so. This method, (call) seeding, has been very   (help) to farmers, and made him win much fame.

    Schaefer believes that for people, most of all, are interested in the world and everything in it, a college degree is unnecessary.

China is a beautiful country, we are proud. （介词+which/whom）

补写出下列名篇名句中的空缺部分。

有NaCl、CaCl₂、AlCl₃三种溶液，分别与足量的AgNO₃溶液反应：①若所含溶质的物质的量相等，则生成沉淀的物质的量之比是；②若生成沉淀的质量相等，则三种溶液中所含溶质的物质的量之比是．

阅读下面的文字，完成下面小题｡

购物时“刷脸”支付，进小区时“刷脸”开门，生活中的刷脸现象        ｡伴随着人工智能技术的突飞猛进，作为大数据时代关键性的数据“人脸”，正以其唯一性和较好的防伪性，促使着人脸识别技术深度地融入民生服务､城市治理､安全保障等领域｡如国家政务“刷脸”，节约了办事时间；电子交警“刷脸”，识别违法行为；新冠肺炎疫情防控期间， “人脸识别+测温”设备，更是极大提高了体温检测的效率｡此外，基于人脸识别的人工智能相关产业快速发展，成为创新创业的风口｡据统计，目前我国共有超过1万家人脸识别相关企业，今年前三季度注册量达1161家｡

（          ）｡对此我们不能        ， 谈“刷脸”而色变；也不能掉以轻心，置安全而罔顾｡我们要理性对待，明确界定人脸数据的所有权､使用权､管理权､交易权等，进一步完善相关法规，加大对数据滥用､侵犯个人隐私等行为的监管力度，及时解决个人信息泄露等漏洞，让全社会更加严谨地使用､采集人脸数据，从而切实        个人权益，推动相关行业良性发展｡

氯元素的天然同位素有³⁵Cl 和³⁷Cl 。氯元素的相对原子质量为35.45，则天然氯元素中³⁵Cl 和³⁷Cl的原子数目之比约为(   )

著名的“侯氏制碱法”的第一步反应是向饱和食盐水中通入CO₂而析出NaHCO₃ ， 该反应可表示为：NH₃+NaCl+CO₂+H₂O═NaHCO₃↓+NH₄Cl

已知NaCl、NaHCO₃、NH₄Cl如下温度的溶解度：

物质	NaCl	NaHCO3	NH4Cl
40℃时溶解度/g	37	13	46
10℃时溶解度/g			33

今在40℃时，向434g饱和食盐水中通入44.8L（标准状况）NH₃ ， 再向溶液中通入过量的CO₂ ， 求：

（1）可析出NaHCO₃多少克？

（2）NH₄Cl能否析出？

（3）若降温至10℃，可析出NH₄Cl多少克？

（4）降温至10℃时，若要析出更多的NH₄Cl晶体应采取什么措施？

下列说法正确的是（   ）