单项选择题

The purpose of input device is () .

A、to enter commands
B、to hold instructions
C、to input data
D、both a and c
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单项选择题
Moses is the brother of ().
A、Mary
B、Miriam
C、DJ
D、the old pharaoh
单项选择题
Tests have proved this medicine quite effective. Starting from next month, we are going to produce it on a large ().
A、scale
B、range
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