能源资源要素成本长期被低估，而资源环境对我国经济增长的约束在强化。半年前，中国国

关于用回归分析法建立市盈率模型的说法，正确的是（）。

A.这些模型的有效性有限

B.这些模型短期是有效的

C.这些模型长期是有效的

D.在新兴市场比较有效

统计资料表明，某国2013年8月份，工厂所在行业人才供求状况为：平均每天可支配时间16小时，平均每人每天如工作8小时，可得收入80元，此时需求量为20万人。1个月后，情况发生变化，每人可支配时间仍为16小时，只是如每人每天工作8小时，可得收入160元。但实际每人每天只工作6小时，此时，需求量为50万人。根据以上资料，回答下列问题：

2013年9月份时，平均每人只愿工作6小时，这是因为工资率的提高会引发（）。

A.替代效应

B.互补效应

C.递减效应

D.收入效应

阅读理解。

                                                                        What's On

     Oscar Film Themes Symphony Concert Film highlights accompanied by live performances of movie theme

music by the China Opera and Dance Drama Theatre Symphony Orchestra, which has recorded the music for

many films. Familiar tunes will come from such films as Titanic, Jurassic Park and Waterloo Bridge.

     Where: Nationality Cultural Palace Theatre When: March 8, 7: 30 pm Admission: 80--380 yuan

Tel: 65287674 ext, 508

     Fantastic View All the Way

     The mountains in this area are not very high, but the views are excellent. This walk is gentle and very

interesting, going through valleys, over passes, along a ridge and through a few little peaceful villages that are

located in amazing places. Many sites along the walk offer the most heautiful view of the surrounding mountains.

     Where: Pinggu, northeast of Beijing When.. March 9, meet 8: 20 am outside Starbueks at Lido Hotel, or 9

am at Capital Paradise front gate, return 5: 00 pm. Admission: adults 150 yuan. Children 100 yuan

Tel: 13701003649 Email: fjhikers @yahoo. com. cn

     Spring Greetings

     Paintings in bold colors in a traditional Chinese style by the young artist Tian Xifeng are displayed to

welcome the spring. Tian is a student of famous bird-and-flower painting artist Wang Qing. He has won several prizes at various national painting exhibitions and developed a style emphasizing vivid close ups of natural scenes.

     Where: Melodic Gallery, 14 Jianwai Dajie, opposite Friendship Store When: till March 31,9 am - 5 pm

Admission: free Tel: 65188123

      Cala, My Dog

     Directed by Lu Xuechang, starring Ge You. The story is about a middle-aged working man. known as

Lao Er, whose chief source of stability and comfort in life is his dog, Cala. One day, when his wife is out

walking Cala, a policeman confiscates (没收)the unregistered dog. As Lao Er tries to recover his dog, the

difficult circumstances of his life are revealed. Chinese with English subtitle (字幕).

     Where: Dongchuang Theatre, 4 Xinzhongjie, Dong Menwai When: March 13 and 20, 8: 30pm Admission

20 yuan Tel: 64169253

1. If you are a music lover, you can go to _____ on Women's Day.

A. Capital Paradise

B. Nationality Cultural Palace Theatre

C. Capital Gymnasium

D. Dongchuang Theatre

2. The exhibition held in Melodic Gallery ______.

A. is open to the public from 7: 30 am--5: 00 pm till April 1st

B. presents the works by Tian Xifeng and his teacher

C. is to display some bird-and-flower paintings

D. costs the painting lovers much money to visit

3. All of the following statements are correct except that ______.

A. you'll have lo dial 65188123 to book a ticket for the film

B. both adults and children can lake part in the walk in Pinggu

C. even if you don't know English, you can enjoy Cala, My Dog

D. you'll have a choice of two meeting places on March 9th

4. All the advertisements in this passage are about ______.

A. music

B. movies

C. exhibitions

D. entertainments

某市公交企业拥有公共交通营运车辆800辆，全市经营的公共交通线路长度为2100千米，公共交通线路重复系数为1.4，公共交通线网密度为3.75千米/平方千米，城市乘客平均乘距为4千米，每条线路平均车辆数10辆，车辆在营运线路上每完成一个周转所耗费的时间平均为75分钟。
根据以上资料，回答下列问题：

该市公共交通线网长度为______千米。

A．2100

B．1500

C．1450

D．1300

E．1200