By__________ a cheaper material for the steel in our products, we ca-考呗网题库移动版

单选题 By__________ a cheaper material for the steel in our products, we can greatly reduce manufacturing costs.

A．substituting
B．replacing
C．alternating
D．displacing

参考答案A

解析: 句子表示“用更便宜的材料代替钢铁”，意为“用A代替B”的词组substitute A for B放在空格处的句意最自然，故选A。

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单选题 If your computer__________ experience any problems within the warranty period, you can take it to an authorized repair center free of charge.

A．will
B．should
C．had
D．would

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单选题 All of the machinery must be carefully inspected before production at the plant is allowed to__________.

A．inhibit
B．comply
C．motivate
D．proceed

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单选题 If you have not received __________ of your order within two business days, please contact our customer service center.

A．confirmation
B．resignation
C．preparation
D．expectation

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