（本题满分14分）如图，α⊥β，α∩β=l， A∈α， B∈β，点A在直线l上的射影为A₁， 点B在l的射影为B₁，已知AB=2，AA₁=1， BB₁=， 求:
(Ⅰ) 直线AB分别与平面α，β所成角的大小;
(Ⅱ)二面角A₁－AB－B₁的余弦值．

将分别标有“6V 9W”和“6V 3W”的两个灯泡L₁、L₂串联接在12V电源上，则（　　）

A．两灯都能正常发光

B．灯L2要被烧坏

C．两灯都比正常发光时暗

D．灯L1比灯L2亮

图是我国某城市布局规划图，要在A、B、C、D四个地区拟建火力发电厂、自来水厂、印染厂、服装厂，并在城郊建立副食品基地及进行绿化建设。试从经济效益、环境因素考虑，回答下列问题

（1）自来水厂应建在________处，理由是________。
（2）火力发电厂应建在________处，理由是________。
（3）印染厂应建在________处，理由是________。
（4）服装厂应建在________处，理由是________。

A famous foreign company in China wanted a Clerk for its public relation department (公关部).
A beautiful girl with a master's degree(硕士学位) went through a lot of challenges and her name was on the list. In the final stage she faced an interview together -with another girl. Both of them were outstanding,
not only in looks but also in education.
The girl was successful in the interview. It seemed that she would get the chance. At last the examiner asked her, "Can you come to the office next Monday?" Shocked by the unexpected question, the beautiful girl couldn't make a decision at the moment, so she said, "I have to talk with my parents before I give an answer. " The examiner felt surprised but said calmly, "If so, let' s wait till you are ready. "
The next day, the girl came to tell the examiner that her parents had agreed to let her begin work next Monday. But the examiner said regretfully (遗憾地), "Sorry, another suitable candidate (选手)has got the job. You had better try another place. "The beautiful girl was surprised. She asked for an explanation(解释) and was told, "What is needed here is a person who knows her own mind. "
That was how a good opportunity right under the nose of a beautiful girl ran away.
【小题1】 The beautiful girl wanted to ask her parents for advice because_________

A．she didn't like the job	B．she didn’t expect the examiner would ask such a question
C．she didn't want to answer the question	D．her parents would be angry if she didn't ask them

【小题2】 We can learn from the passage that__________

A．the company lost its best clerk	B．no girl got the job
C．the other girl who failed at the last interview might get the job
D．the examiner was very pleased with the girl

【小题3】The examiner regarded_________as the most important.

A．a person's confidence	B．a person's knowledge
C．a person's age	D．a person' s beautiful looks

【小题4】 The underlined phrase "right under the nose of" probably means________

A．就在鼻子下

B．想要得到的

C．没有把握的

D．就在眼前的

【小题5】 The best title for the passage above might be___________

A．Make Decisions With Your Parents	B．A Successful Interview
C．Use Your Own Mind	D．Answer the Examiner's Question Quickly