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Questions 29 to 32 are based on the passage you have just heard.
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论述题2：以下是某软件的规格说明，请按要求回答问题 软件规格说明：文件名的第一个字符必须是A或B，第二个字符必须是数字。满足则修改文件。若第一个字符不为A或B，打印错误信息X12，若第二个字符不为数字，则打印错误信息X13。 (1)根据软件规格说明的描述，画出因果图。 (2)采用因果图法设计该软件的测试用例。
自行车、钟表等行业正处于行业生命周期的成熟期。( )
More than three-quarters of the children we interviewed said they’re sometimes afraid to be home alone. If you decide your child is (67) enough to be home alone before or (68) school, you should make sure your house is (69) and teach your child to (70) various situations. Make a game of your instructions. Have your child answer questions beginning with "What would you do if" and ending with phrases like "you lost your key" (71) "someone you don’t know comes (72) the door." The best home security is (73) . Every home should have smoke detectors, but consider also installing a burglar-alarm system. Leaving a radio (74) during the day makes a home sound (75) . Besides, as one child said, "It’s horrifying walking into a quiet house." Don’t leave an extra key in obvious hiding places, such as under the doormat. (76) it with a neighbor instead. (77) your child is home alone, the phone is a vital (78) . A parent or designated (指定的) adult should always be available by (79) . Children should know where to find (80) numbers, and how to (81) the phone and take a message without letting an unknown caller (82) no one else is home. You might (83) a telephone-answering machine. Your child (84) then be able to pick up the receiver only when he heard a (85) voice. If you help your child understand the precautions you’ve taken, he will feel more (86) about staying home.
More than three-quarters of the children we interviewed said they’re sometimes afraid to be home alone. If you decide your child is (67) enough to be home alone before or (68) school, you should make sure your house is (69) and teach your child to (70) various situations. Make a game of your instructions. Have your child answer questions beginning with "What would you do if" and ending with phrases like "you lost your key" (71) "someone you don’t know comes (72) the door." The best home security is (73) . Every home should have smoke detectors, but consider also installing a burglar-alarm system. Leaving a radio (74) during the day makes a home sound (75) . Besides, as one child said, "It’s horrifying walking into a quiet house." Don’t leave an extra key in obvious hiding places, such as under the doormat. (76) it with a neighbor instead. (77) your child is home alone, the phone is a vital (78) . A parent or designated (指定的) adult should always be available by (79) . Children should know where to find (80) numbers, and how to (81) the phone and take a message without letting an unknown caller (82) no one else is home. You might (83) a telephone-answering machine. Your child (84) then be able to pick up the receiver only when he heard a (85) voice. If you help your child understand the precautions you’ve taken, he will feel more (86) about staying home.
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