The car is environmentally friendly because it uses electricity instead of gas. , it is less expensive.
A. Besides
B. However
C. Instead
D. Therefore
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(答案→)A. Besides
B. However
C. Instead
D. Therefore
解析：考查连词。besides除此之外；however然而，可是；instead反而；therefore因此。句意：汽车是环保的因为它用电而不是汽油，除此之外，它还不贵。