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二、Comprehension(阅读理解，40分) （一）Fill in the blanks with suitable words or expressions from the list given below, and change the form where necessary. （从下面方框中选择合适的词或表达，以其适当的形式填空。）(10分, 每空1分) black box testing; internal; bug; thorough; reveal; output; faults; valid; white box testing ; lifecycle; Software testing, which is defined as the execution of a program to find its（ ）, is a vital part of the software（ ）. There are different types of testing, mainly, they are （ ）or functional testing, which tests whether the（