When teenagers have something difficult to say to their parents, they usually stay alone at home.
A. Right.
B. Wrong.
C. Doesn't say.
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计算机病毒是一段程序,以下______不是病毒的特征。
A. 破坏性
B. 传播性
C. 无规律性
D. 潜伏性
下面不是图像文件格式的是______。
A. JPEG
B. PSD
C. TXT
D. GIF
The stone bit him
A. on the left eye
B. over the left eye
C. in the left eye
When the students came into the classroom, the teacher ______ on the blackboard.
A. was writing
B. is writing
C. wrote