探究影响浮力大小因素的实验中，同学们提出了下列4种猜想：

猜想1：浮力的大小与液体的密度有关；

猜想2：浮力的大小与物体浸入液体中的体积有关；

猜想3：浮力的大小与物体的形状有关；

猜想4：浮力的大小与物体所受的重力有关。

阅读下面材料，从每题所给的A、B、C、D四个选项中选出最佳选项。

A

    Today is Sunday, April 15th, everyone in Sheep Village（羊村）is very busy. What does he/she do?

    I'm Nuan Yangyang. I write a letter to my friend at one o'clock in the afternoon. Then I do my homework.

    I'm Fei Yangyang. I want to be strong（强壮的），so I go to the sports club to play sports in the morning. I go home at three ten in the afternoon.

    I'm Lan Yangyang. I like eating. I have breakfast at home. I have lunch in a restaurant. But the food isn't good, I don't like it.

    I'm Mei Yangyang. I go to a clothes store at nine in the morning. The clothes there are on sale, so I buy a nice skirt.

    I'm Xi Yangyang. I take the bus to the English club at ten sixteen in the morning. There I help two kids learn to speak English.

—Which city has                    population, Beijing, Guiyang or Xingyi?

—Xingyi, of course.

现有一包铝热剂是铝粉和氧化铁粉末的混合物，在高温下使之充分反应，将反应后的固体分为两等份，进行如下实验（计算pH时假定溶液体积没有变化）：
①向其中一份固体中加入100mL 2．0mol·L^－1的NaOH溶液，加热使其充分反应后过滤，测得滤液的pH＝14；
②向另一份固体中加入100mL 4．0 mol·L^－1的HCl溶液，使固体全部溶解，测得反应后所得溶液中只有H⁺、Fe²⁺和Al³⁺三种阳离子且pH=1。
则②产生气体的体积（标准状况）为（   ）

多亏了我的老师，我才能按时完成作业。

   ____  my teacher, I can finish the school work on time.