C. Serious and responsible.

　　D. Cold and casual.

　　答案　C

　　解析　观点态度题。根据倒数第二段中的”And Microsoft acted, issuing a fix for it”及“We took security seriously at Xbox and fixed the issue as soon as we learned about it”可知，微软公司对Davies报告的问题采取了认真负责的态度，对漏洞进行了及时的修复。因此选择C。

　　4．The underlined word

　　“vulnerability” in Paragraph 4 is closest in meaning to

　　.

　　A. security failing

　　B

　　system protection

　　C. system accident

　　D. data fault

　　答案　A

　　解析　词义猜测题。根据第一段中的“after he exposed a security weakness”并结合画线词所在的句子可知，ulnerability应指安全漏洞，因此选择A。

　　B

　　The crowd at the airport flowed forward. The passengers had been waiting for a couple of hours for an airline employee to open the door leading to the plane outside. No one was in a good mood. An old man got trapped in the middle of the rush. He fell down without being able to break his fall. His head hit the concrete floor. Blood poured from his forehead. He appeared to be unconscious. Everyone rushed past him, except Dana. She called for help.

　　A minute later, a young airline employee showed up. Hardly looking at the old man, she told Dana to get aboard her plane. She said the old man would be okay, and walked away.

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