问题
选择题
The car is environmentally friendly because it uses electricity instead of gas. _____, it is less expensive.
A．Besides
B．However
C．Instead
D．Therefore
答案
答案：A
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。