51. A【解析】由上文可知，作者在表演中加入了过多的表情。

　　(D)

　　Mobile phones and the internet have improved our live in many ways. However, alo ng with improvements, they have also brought a number of worrying problems.

　　Many car accidents are caused by mobile phones. You can use many new mobile phones to get on the internet. This can be very convenient, but some drivers get on the internet while driving. Driving needs all our attention. By looking at their mobile phones and not at the road, these insensitive Drivers are a danger to us all.

　　Many of the dangers of the internet are well known. Children who visit websites without their parents permission sometimes talk to ol der people they dont know and put themselves in great danger. People with blogs sometimes post embarrassing photographs of people they dont know on their websites without permission. There are also people who use the internet to get personal information that we do not want them to have.

　　Mobile Phone and Internet Safety Tips

　　◆ If you need to use a mobile phone with you drive use a hands-free phone.

　　◆ In difficult driving situations such as rain or snow, do not use your phone at all.

　　◆ Do not make very important phone calls while driving. They take your attention off the road.

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