有关黄土高原的叙述,正确的是( )
A:地广人稀
B:煤炭资源缺乏
C:地表沟壑纵横
D:生态环境良好
我们看到“农家乐”灶头炉膛中柴禾架空时烧得更旺.这是因为( )
⑴ ____ A. Beijing is a great city.
⑵ ____ B. Time to go back to school.
⑶ ____ C. Don't forget to take some pictures.
⑷ ____ D. I'm putting on my new coat.
⑸ ____ E. What a fun trip!
下列现象中利用了熔化吸热规律的是( )