题干

仅仅根据化学方程式 Na2CO3+2HCl═2NaCl+CO2↑+H2O,不能获得的信息是(  )


A:反应进行得非常快

B:生成的CO2是气态的

C:反应在常温下可以进行

D:反应物是Na2CO3和HCl

上一题 下一题 0.0难度 选择题 更新时间:2019-11-12 09:48:23

答案(点此获取答案解析)

A

同类题4

通读下面短文,掌握其大意,然后在各题所给的四个选项中选出一个最佳答案。

    Growing up is not always easy. When facing difficulties, courage and a spirit of independence (独立)can be more useful than crying for help. That's what's the story I've heard recently tells me.

    The young man was born in 1982 in a 1 family in a small town .When he was only 11, his father became mentally ill and one day came back with an abandoned baby (弃儿) girl. A year later, his 2 left home with his younger brother because she couldn't  3 hard life and pressure from her mad husband. The 12-year-old boy began to 4 his whole family: he took care of not only his sic k father, but also the little girl. 5, he didn't give up studying. Later he went to college. To care for the little girl, he rented a room near his college and 6 her education by doing part-time jobs.

    After the young man's story went public, people were deeply impressed by his behavior.

7 his life was hard, he didn't abandon his father and his sister because 8 needed his help very much. And he 9 donations from others. He said he felt 10 because of kind offers, but he could depend on his own work. With his hard –won money, he 11 helped other students in trouble .

    Today when many young people worry more about their own happiness, this young man's behavior reminds us of what we don't usually 12: love and care for others. Nobody could continue to live 13 these.

    Through his hard life, the young man is regarded as a 14. So when facing difficulties, don't 15 bad luck. Consider what more you could do for your family and society, and you'll find the world smiling back.