关于价格水平与利息率之间的关系，下列说法中正确的是( )。A．名义利率不变时，实际

图中属于动物先天性行为的是（　　）

A．

蚯蚓走迷宫

B．小鸟喂鱼

C．

大山雀喝牛奶

D．

黑猩猩摘取香蕉

某患者，男，15岁。检查：恒牙牙合，第一磨牙关系呈中性，上下颌尖牙唇向低位，无间隙。上下颌右侧中切牙反牙合，上颌牙列拥挤9mm，下颌牙列拥挤7mm，外观无骨骼畸形。X线头影测量：各测量值基本在正常范围之内。

你认为该患者的矫治方案首选的矫治方法为 （）

A.FRⅢ型功能矫治器矫治

B.直丝弓矫治器固定矫治

C.twinblock矫治器功能矫治

D.正颌外科手术矫治

E.活动矫治器和固定矫治器联合二期矫治

下面图片反映的历史事件有什么重大意义？

A．美国被迫在停战协议上签字

B．中朝人民取得反侵略战争的胜利

C．标志着朝鲜半岛的统一

D．彻底消灭了美帝国主义

The world’s native languages are dying out at an unprecedented(空前的) rate, taking with them irreplaceable(不能替代的) knowledge about the natural world, according to a new study.

The study identified five global “hot spots” where languages are vanishing faster than anywhere else ---- eastern Siberia, northern Australia, central South America, the US state of Oklahoma and the US Pacific Northwest. “Languages are suffering a global extinction crisis that greatly goes beyond the pace of species extinction,” linguistics(语言学的) professor David Harrison noted, who said half of the world’s 7,000 languages were expected to disappear before the end of the century.

Native people had an intimate(详尽的) knowledge of their environment that was lost when their language disappeared, along with other certain things often unfamiliar to us, Harrison stressed. “Most of what we know about species and ecosystems is not written down anywhere, it’s only in people’s heads,” he said. “We are seeing in front of our eyes the loss of the human knowledge base.”

Harrison was one of a team of linguists who carried out the study. The researchers traveled to Australia this year to study native languages, some of the most endangered. According to Harrison, in Australia, they were heartened to see a woman in her 80s who was one of the only three remaining speakers of the Yawuru language passing on her knowledge to schoolchildren. He said such inter-generational exchanges were the only way native languages could survive. “The children had elected to take this course, no one forced them,” he said. “When we asked them why they were learning it, they said,‘This is a dying language, we need to learn it’.” Also, while there they found a man with knowledge of the  Amurdag  language, which had previously been thought extinct.

The researchers said all five of the hot spots identified were areas that had been successfully colonized and where a dominant language such as Spanish or English was threatening native tongues.

小题1:What does this text mainly talk about?

A．A study on native languages endangered.

B．The knowledge of native languages.

C．People’s efforts in saving native languages.

D．Harrison and his study on languages.小题2:The underlined word“vanishing”in the second paragraph can be best replaced by        .

A．developing

B．changing

C．increasing

D．Disappearing小题3:According to Harrison, language extinction        .

A．causes the researchers lots of worries

B．speeds up the pace of species extinction

C．threatens the existing of Spanish and English

D．brings about a loss of knowledge about the environment小题4:Which of the following can be described as good news?

A．Native languages became less endangered in Australia.

B．A man was found with knowledge of the Amurdag language.

C．Researchers were well received by native people in Australia.

D．Many schoolchildren showed interest in the Yawuru language.

机车的维修制度大致可以分为三种，即计划修、弹性计划修和（）

A.运用状态修

B.诊断状态修

C.换件修

D.随时修