欧美国家率先实现了从有机物经济向无机物经济的转变，即生产活动中的动力来源从动植物向矿物的转变。直接推动这一转变的是(  )

阅读《蜀道难》选段，完成小题。

    噫吁曦，危乎高哉！蜀道之难，难于上青天。蚕丛及鱼凫，开国何茫然。尔来四万八千岁，不与秦塞通人烟。西当太白有鸟道，可以横绝峨眉巅。地崩山摧壮士死，然后天梯石栈相钩连。上有六龙回日之高标，下有冲波逆折之回川。黄鹤之飞尚不得过，猿猱欲度愁攀援。青泥何盘盘，百步九折萦岩峦。扪参历井仰胁息，以手抚膺坐长叹。

看图读一读，判断句子正(√)误(×)。

Ann: What's this, Tom?

Tom: It's my robot. It can walk(走路). It's red and black. It's super. I like robots. Do you likerobots, Ann?

Ann: No, I don't like robots.

Tom: What do you like?

Ann: I like toy bears. They're soft.They're lovely.

在减数分裂过程中，保证同源染色体能等量地分配到不同的子细胞中去的染色体行为是

根据短文内容及首字母提示，填写所缺单词。

    Learning a new language is always a challenge. There are new w____ , new grammar, and new pronunciation. Language is an important part of c____. Becoming familiar with the culture as well as the language can make the learning experience much more i____.

    When I was a university student, I s____ Chinese for three years. Before I went to university, I had very little k____ of China. Therefore, when I started learning to speak Chinese, it was important for me to also learn about China's history and culture. China's culture is very different from my o____ and I become interested in it soon.

    It will be much more fun to learn about culture w____ you study a new language. Culture can teach you so many things about a language. It can give you background information a____ the language and tell you the history of the language. I also found out one fact, that is, if you know about the country and the culture, you will communicate with its people more e____.

    Whenever I try to learn a new language, I enjoy k____ information about the culture as well. It's a challenge to learn more information, but it is very rewarding!