题目内容：
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
参考答案：
选择题：There is / are ___________.
- 题目分类：国家开放大学人文英语2
- 题目类型：选择题
- 查看权限：VIP
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