单项选择题The experiment described in the passage shows that ______.
单项选择题Netwar should be understood as a war aimed at ______.
单项选择题Which of the following is NOT mentioned as a high-risk group in danger of contracting AIDS
单项选择题According to the passage, which of the following could be considered as a healthy diet
单项选择题The word Wunderkind probably means ______.