局域网的英文缩写是LAN，广域网的英文缩写是WAN。
参考答案：对
Some teenagers _______ their health because they often expose themselves to so many electric products.
A．have damaged
B．are damaging
C．damaged
D．will damage
以BAT为代表的互联网公司是指百度、阿里巴巴和（）
A．淘宝
B．天翼电子商务有限公司
C．YouTube
D．腾讯
