单项选择题

A．Affecting the mouse.
B．Affecting the keyboard.
C．Affecting the hard disk.
D．Affecting the crust of the computer.
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单项选择题
A．The class should all be involved in lively discussions.B．The students should listen attentively to the teacher.C．The teacher should help the students to talk loudly.D．All students should be able to repeat themselves.
A．The class should all be involved in lively discussions.
B．The students should listen attentively to the teacher.
C．The teacher should help the students to talk loudly.
D．All students should be able to repeat themselves.
单项选择题
A．Amino acid.B．Body’s natural rhythm.C．Exhaustion.D．Difficulty going to sleep.
A．Amino acid.
B．Body’s natural rhythm.
C．Exhaustion.
D．Difficulty going to sleep.
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