题目内容
信息加密和信息隐藏式信息安全的两种主要手段。（）
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水印的嵌入、提取时只能采用一种密钥。（ ）
Thrown into a demanding environment, students may have difficulty __________ the stress, and then they may turn to ________ even when they are not hungry. When people eat to reduce stress, it is called __________eating.
1)Whatkindofchildrendoesthespeakertalkabout?
2)Whatdidpeoplefindoutabouttheboywholivedinajungle?
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