旅客持硬卧上铺车票因病要求变更下铺时,代用票事由栏应填()。
A.变卧
B.变铺
C.补卧
D.补价
参考答案:B
单词拼写。
1. He didn't work hard all the term. So it's o_____ that he can't pass the final examination.
2. The teacher gave no r_____ to Tom's composition, and left the classroom without a word.
3. In order to resist against the earthquake, the s_____ of the building has been red-signed in common.
4. She s_____ on her bedside lamp and tried to read.
5. As we all know Mao Zedong has a strong Hunan a_____ .
6. The male birds have_____ (与众不同的) black and white marks on their heads.
7. In English the spelling of words doesn't always _____(代表) the sound.
8. She is an excellent _____(语言学家) known all over the world.
9. You should do more and try your best to _____(影响)him.
10. I went to the bookstore yesterday and bought a _____ (参考) book.
传统理论认为,人类祖先由于气候变化、树木减少,被迫离开树栖环境,选择在地面上直立行走。一项最新研究则认为,早期人类直立行走源自现今非洲东部和南部崎岖山脉地区,该地形是上新世时期火山喷发和构造板块移动形成的。人类的祖先被岩石地形和峡谷所吸引,这里可提供很好的庇护栖息地,同时有机会诱捕猎物;这种环境要求早期人类具备直立行走和攀登的能力,因此人类祖先最终逐渐进化为两足直立行走。 下列哪项与最新研究的结论相符?
A.气候变化导致早期人类选择直立行走
B.人类祖先选择直立行走是为了更好适应地形环境
C.地质条件的变化改变了人类早期祖先的行走方式
D.人类祖先由于食物匮乏被迫离开最初的生活环境