A-A+
The unwanted e-mail problem can be solved if _
问题详情
The unwanted e-mail problem can be solved if ______.
A．the government takes action
B．a new technology is adopted
C．more people are aware of the problem
D．joint efforts are made and new technology is used
参考答案
正确答案：D
解析：细节题型。见最后一段。选项A、B、C的内容都对，但都不全面：只有选项D(人们共同的努力和新技术的使用)最全面，应选作答案。
