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题目内容
（国家开放大学人文英语2）
There is / are ___________.
选择一项：
A.
various difficulties in keeping the Internet security
B.
no serious security issues in the Internet industry
C.
worldwide common regulations to maintain cyberspace security
选择一项：
A.
various difficulties in keeping the Internet security
B.
no serious security issues in the Internet industry
C.
worldwide common regulations to maintain cyberspace security
参考答案