According to the passage, foreign language students who do not communicate with native
A. learn very much about the foreign society
B. learn about the history of the foreign language
C. have to worry about making mistakes
D. take advantage of available language
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13______.
A. in
B. at
C. over
D. on
图中所示标志是 。
A. 警告标志
B. 禁令标志
C. 指示标志
D. 指路标志
在肌电生物反馈疗法诊室训练的操作步骤中,错误的是()。