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本文从以下几个角度介绍。

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2、[学科网]2025届高三4月大联考生物(新课标卷)试题


G.Tourists can help care for the gardens at a museum for free admission.
第三部分 语言运用（共两节，满分30分）
第一节 完形填空（共15小题：每小题1分，满分15分）
阅读下面短文，从短文后各题所给的A、B、C、D四个选项中选出可以填入空白处的最佳选项。
A few days before Thanksgiving every year，Hong Ly settles into a chair at his home to write a thank-you email to Steve Greene，an American who helped his family escape from Saigon at the end of the Vietnam War in 1975.
“We wish you a healthy and happy Thanksgiving!"Ly wrote to Steve Creene.“Your help to 41 my family out of 42 Vietnam is always in my heart.I look at you as my Statue of Liberty.Every Thanksgiving and Christmas，my family is 43 together.Were it not for you，we might not be here."
During the early 1970s，he became friends with Greene.Later，with North Vietnamese troops 44 on Saigon，Greene 45 thought of Ly and his family.He 46 Ly that he would do everything he could to ensure his family's safe withdrawal from Saigon.Greene says，he tried twice to assist them in escaping from the country，but they were 47 each time at the airport because they didn't have the proper paperwork.Greene went to the US Embassy（大使馆）and 48 an officer to give him an official document.That did the 49 and on April 21.their third 50 to get on a plane was successful.


C．sad
D．terrible
（3）Which of the following is UAE's Health and Prevention Ministry's greeting way？ _____
（4）What's the best title of the passage？ _____
A．Greetings during the outbreak of COVID-19
B．Different ways to say hello
C．How to keep close contact


4、[学科网]2025届高三4月大联考地理(新课标卷)试题


5、[学科网]2025届高三4月大联考地理(新课标卷)试题


6、[学科网]2025届高三4月大联考政治(新课标卷)试题


3、[学科网]2025届高三4月大联考历史(新课标卷)试题


3、[学科网]2025届高三4月大联考历史(新课标卷)试题


4、[学科网]2025届高三4月大联考语文(新课标卷)试题


C.生成物门丁中碳元素和氧元素的质量比为1：2D.参加反应的甲和乙的分子个数比为2：7


D. 打开钢瓶释放氧气时氧气由液态变为气态，氧分子间的间隙变大，故正确；
故答案为：D。
【分析】根据分子的基本特征：分子质量和体积都很小；分子之间有间隔；分子是在不断运动的；同种的分子性质相同，不同种的分子性质不同分析。
9．【答案】A
【知识点】氧气与碳、磷、硫、铁等物质的反应现象
【解析】【解答】A、 木炭在氧气中剧烈燃烧，生成使澄清石灰水变浑浊的气体，符合题意；
B、 硫在空气中燃烧，发出淡蓝色火焰 ，不符合题意；


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