30. The word “ donating” in line 2 is closest in meaning to...
A. selling B. buying C. taking D. giving
V. Choose the best answer for each space A, B, C or D.
In order to (31)...the amount of energy used, people have invented many energy-
saving (32)...appliances. they also use a (33)...scheme to show how much energy
each appliance can save, so that (34) ...know what to choose. Besides, they have
also been searching for other sources of energy that can (35)...electricity.
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