填空题

【参考答案】

改“are”为“is”
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填空题
改“if”为“though”
单项选择题
Which of the following statements is not true
A．Robots will be less expensive than they are now.
B．They will be used as aides for the disabled.
C．They will all be gentle and kind.
D．They will deal with intruders.
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