A Company.com developer is designing a multi-tier web application and discovers a need to hide the details of establishing and maintaining remote communications from the client. In addition， because the business and resource tiers are distributed， the ap

参考答案：对

正确答案：B
39．B【精析】develop from由…发展而来；differ from不同于…；depart from违反，背离（常规）；derive from起源于。这里讲的是水力电站与潮汐电站在供电的持续性方面的不同之处，故选B。

正确答案：C
解答参考：C.rebuild：重建，如rebuild their homes(重建他们的家园);develop：发展，开发，如develop tourism(发展旅游业);flourish：繁荣，茂盛，指事业的发展或植物的长势处于欣欣向荣的时期;prosper：繁荣，昌盛，指人或企业经济上的成功或昌盛，如：China is prospering under a strong government(在一个强有力的政府的领导下，中国正逐渐繁荣昌盛)。句中指的是植物生长茂盛，故选C)。【译文】这种植物尤其在当地生长茂盛。

参考答案：A

参考答案：C

参考答案：Self-uation is not something that can be taught. It can be gradually developed by teachers themselves as they become more aware of their own teaching and of all the different factors that affect learning. In order to uate themselves, teachers must learn to observe themselves. Obviously, teachers cannot normally observe themselves directly, but there are ways in which they can observe themselves indirectly:— By careful planning before the lesson, followed by careful reflection after the lesson on what actually took place.— By observing other teachers’ lessons and comparing them with what happens in your own classes.—By inviting other teachers to observe your classes, and discussing the lesson with them afterwards.

参考答案：D

参考答案：C

参考答案：B

答案：B

解析：