30.What does the author intend to do in the last paragraph?
A.Summarize the previous paragraphs.
B.Introduce a new topic for discussion.
C.Tell us not to use public WiFi at random.
D.Advise us to shut public WiFi completely.
31.What can be a suitable title for the text?
A.How to Make A Phone Call by Yourself
B.How to Communicate with Your Friends by Phone
C.How to Update And Activate Your Phone’s Apps on Your Own
D.How to Make Sure Your Phone Stays Private And Secure
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