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质量相等、初始温度相同的水和煤油各一杯，用相同的酒精灯同时加热相同的时间，这时（　　）

阅读下面这首诗，回答问题。
                                                                                                            春望
                                                                                                           杜甫
                                                                                           国破山河在，城春草木深。
                                                                                           感时花溅泪，恨别鸟惊心。
                                                                                           烽火连三月，家书抵万金。
                                                                                           白头搔更短，浑欲不胜簪。

完形填空

    My husband Jeff and I moved into our new home in Scottsbluff last year just before Christmas. I did not have the 1 or energy to carry out my traditional Christmas decorating and baking activities. What was the point, anyway? It was going to be a 2 Christmas after all.

    3, the neighborly nature of west Nebraska residents started to trickle (陆续来临) in.

    There was a 4on the door one evening. It was Jeff's new colleague, John Smith, and his wife, Phyllis. The Smiths had stopped by to 5 us with a loaf of homemade bread. They pointed out a 6 on the porch (门廊). Apparently the doorbell wasn't working in the cold snowy weather and we had 7 a visit from the Browns, our across-the-street neighbors, who brought us a Christmas card and more Christmas cookies.

    The 8 feelings brought by these thoughtful gestures lasted longer than the food.

    As Jeff and I were9 pre-Christmas snow from our driveway, Ernie Guzman came over from next door to 10 us to dig out.

    Then, we received an invitation to 11 a Christmas Eve meal with our neighbors, Ernie and Nancy Sommer, and their 12—a 90-year-old lady, who also had no family in the immediate area with whom to spend the holiday.

    Our Christmas Eve was quite merry, thanks to our 13. Our Christmas morning 14 was special, thanks to the Smiths' gift of bread. I was so 15 for these gestures of welcome, especially during the holidays.

    This year, we were again unable to be with our families for Christmas. The 16 and work schedules just made things too difficult. 17 that sense of Christmas isolation (孤立) all too well, we decided to try to round up some other folks who were 18 in the holidays.

    Lonely people are all around us, but most of us 19 notice them. Just take a look around you. Sometimes, the smallest 20 gesture can make a world of difference.

读北京景观图，完成下列各题．

罗马《民法大全》规定，“无论在何种情况下，禁止把妇女关进监狱，如果妇女被指控犯有严重的罪行，她将被送进修道院”。这说明罗马《民法大全》（   ）

赏月吃月饼的节日是：（   ）

民谣“山西人，大褥套，发财还家盖房置地养老少”反映了古代山西人外出经商的普遍追求。从中也可解释近代晋商衰落的原因是（      ）

如图所示，空间中存在着水平向右的匀强电场，电场强度大小为 ，同时存在着水平方向的匀强磁场，其方向与电场方向垂直，磁感应强度大小B=0.5 T。有一带正电的小球，质量m=1×10^–6 kg，电荷量q=2×10^–6 C，正以速度v在图示的竖直面内做匀速直线运动，当经过P点时撤掉磁场（不考虑磁场消失引起的电磁感应现象），取g=10 m/s²。求：

塑料PET的一种合成路线如下图所示，其中①和②均为可逆反应。

下列说法错误的是（   ）

“1935年1月的一次会议上，一向发言很少准备提纲的这次却破例了。他不仅说明军事失利问题的原因在于进攻时的冒险主义，防御时的保守主义，突围时的逃跑主义，而且阐述了中国革命的战略问题。”以下说法与这次会议相关的是（　　）

This is a ball.

读经纬网图，完成下列各题。

下列关于原核生物和真核生物的叙述，正确的是（　　）

Hi! I ______ Lucy.

关于下图的说法正确的是（  ）

2020年7月23日，首次承担火星探测任务的"天问一号"探测器在海南文昌航天发射场发射升空。据此，"天问一号"探测器选择在文昌航天发射基地发射的主要原因是该基地（   ）

①地处低纬度，探测器可获得较大的初始速度②临海，利于大型运载火箭结构件的运输

③正值旱季，晴天多，天气条件好④海拔高，大气洁净度高，节省发射燃料

若a，b是任意实数，且a>b，则（ ）

（1）如图所示的日晷是通过观察直杆在阳光下影子的方位和长短来确定时间，其中影子的形成可以用光的 来解释．

（2）由于光线照射到人的脸、衣服等上面产生 （选填“镜面”或“漫”）反射，所以老师能从不同的方向看到同学们．

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再现史前人类生活。阅读材料，回答问题。

补写出下列句子中的空缺部分。