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11. Two friends Nam and Lan are talking about the topic of global warming.

Lan: “How can ordinary people help protect the environment?”

Nam: “ _____________”

A. What can ordinary people do to help the environment?

B. Environment really needs our help.

C. We may use environmentally-friendly products.

D. Both governments and individuals are to blame on.

Choose the letter A, B, C or D as the best answer to complete the following sentences: