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问题 选择题

候鸟是指在繁殖地和越冬地之间进行季节性迁徙的鸟类。每年4～5月，大量斑尾塍鹬从澳大利亚迁徙到北冰洋沿岸的科雷马河口。下图为科学家通过卫星追踪一只标号为“H3”斑尾塍鹬的迁徙路线，读图回答题。

小题1:关于“H3”斑尾塍鹬的北迁，说法正确的是

A．科雷马河口为越冬地

B．飞行约一万公里

C．沿途各地昼长夜短

D．途经山东半岛时正值雨季小题2:“H3”斑尾塍鹬没有经过的森林类型是

A．热带雨林

B．针叶林

C．落叶阔叶林

D．常绿硬叶林

答案

小题1:B

小题2:D

题目分析：

小题1:从图中可以看出，尾塍鹬在5月19日飞到北冰洋沿岸，因此该鸟是在科雷马河口过夏季。4月22日至5月17日途经山东半岛，此时山东的雨季未到，正是春旱季节。4-5月，太阳直射北半球，因此南半球的昼短于夜，北半球昼大于夜。飞行距离约跨纬度90°，实际距离约一万公里。

小题2:结合图示其经过地区的植被类型有东南亚的热带雨林；我国东部沿海地区的亚热带常绿阔叶林带和温带落叶阔叶林带和俄罗斯北部的亚寒带针叶林带，常绿硬叶林为地中海气候下的植被类型，图示没有经过。

点评：本题难度一般，抓住各地区的时间和季节信息是解题的关键。并能结合图示判断世界区域的气候类型和植被类型的分布分析。

填空题

Of all the employed workers in the United States, 12.5 million are part of a temporary workforce. The United States Bureau of Labor Statistics counts 9.2 percent of workers as those who have______(1) they term "alternative employment arrangements." The government predicts that temporary staffing agencies______(2) experience growth of 49 percent by 2010. If numbers increase at the rate ______ (3), these companies will add 1.9 million new jobs by 2010. That’’s more than any______(4) industry.Temporary workers were the first ones to be affected by the recent economic recession, but they are______(5) to be the first to regain positions as the economy picks up and companies work to rebuild. Employers use temporary workers as a resource because_______(6) offer flexibility and come at a low cost. Many temporaries are categorized as "independent contractors" instead of employees,______(7) allows the employer to avoid______(8) certain taxes. Because they are not required to offer benefits to temporary workers, companies can save a great deal of money by hiring temps. Usually, temporary workers can qualify_______(9) benefits if they work for a staffing company for a certain length of time. Most temps, however, do not continue with one company long______(10) to qualify for them because they regard the position as a step on the ladder to a______(11) position later.According to Richard Wahlquist, president of the American Staffing Association, 75_______(12) of temporary workers hope for transition out of the temporary staffing category______(13) a period of time. Wahlquist finds that temporary workers spend about 11 weeks on various assignments before their______(14) out of the temporary workforce. Many use temporary positions to gain experience and skills______(15) they move on to better jobs. Wahlquist says that the temp workforce as a whole turns______(16) 400 percent each year.Tom Dilworth, research director at the Employment Policies Institute, explains______(17) some workers like having temporary jobs______(18) it affords them a great deal of elasticity with time and everything. Some temps only have a limited______(19) of time to work and temp agencies can help coordinate jobs to fit their schedules. Other sometimes-employees use temporary jobs to get an______(20) to a company from the inside, to get a foot in the door of a certain business or career._______(21) others take temporary positions in hopes their employers will change them over to permanent positions eventually.Nearly all the industries in the United States use temporary workers.______(22) to Tim Costello, coordinator of the North American Alliance for Fair Employment, the growth of temporary labor threatens______(23) job security of permanent workers who fear replacement, as well as the temps who are more accustomed to turnover. He predicts that there will continue to______(24) a gradual shift from permanent employees to contingent staffing, and that such a_____(25) in workplace demographics will "lead to lower wages, poorer working conditions, and more instability."
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单项选择题

在目前电话网络提供的频带刻度宽度为3.4kz的语音传输信道上能够实现的最高传输速率为（）kbit/s。

A.16

B.56

C.64

D.128
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