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单选题英语六级

2017-05-11

A．Reclaimed wood.

B．Recycled materials.

C．The massive amounts of concrete.

D．The special tiles used for converting energy from the sun.

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参考答案

Which is one of the biggest sources of carbon dioxide in manufacturing?

A．Using email and social media.

B．Sending letters home.

C．Establishing computer training centers.

D．Offering babysitting service.

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A．Social media like skype.

B．Free online translation sites.

C．Face-to-face meetings.

D．Social networking tools.

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A．Because not every school provides social media services.

B．Because not all parents can use networking tools.

C．Because some parents may not have Internet access.

D．Because teachers don't have time for online meetings.

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