如果网络恐怖分子获得公司文件的访问权，将是非常危险的。
A. It will be danger if the cyber-terrorists gain access to the company’s files.
B. It will be dangerous unless the cyber-terrorists gain access to the company’s files.
C. It will be of great danger if the cyber-terrorists gain access to the company’s files.
D. It will be of great danger for fear that the cyber-terrorists gain access to the company’s files.
对于即将出现的问题，抱怨不是一个可行的解决方案。
A. For the ongoing problem，complaining is not a workable solution.
B. For the upcoming problem，complaining is not a workable plan.
C. With the upcoming problem，complaining is not a possible solution.
D. For the upcoming problem，complaining is not a workable solution.
一个好老师必须能够发现每个学生的潜在弱点。
A good teacher must be identified potential weaknesses in each student.
B. A good teacher must be able to identify potential weaknesses in each student.
C. A good teacher must be able to identify potential weaknesses in each of student.
D. A good teacher must be able to identify week potential in each student.
洪都拉斯并未在解决非法移民问题上作出足够的努力。因此，美国总统威胁要切断对该国的经济援助。
A. Honduras hasn’t done enough in dealing with the problem of illegal immigrants. However, the U.President threatened to cut off economic aid to the country.
B. Honduras has spared no efforts in tacklingthe problem of illegal immigrants. As a result, the U.President threatened to cut off economic aid to the country.
C. Honduras hasn’t done enough in tackling the problem of illegal immigrants. As a result, the U.President threatened to cut off economic aid to the country.
D. Honduras hasn’t done enough in tackling the problem of illegal immigrants. As a result, the U.President threatened to be cut off economic aid to the country.
I/O设备与主机交换信息有哪几种控制方式?各有何优缺点，适合什么样的I/O设备？
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