下表是某市的恩格尔系数的变化情况
A.食品支出占家庭总支出的比重增加
B.家庭食品支出额在减少
C.消费结构不断改善,生活水平提高
D.以发展资料和享受资料的消费为主
答案:C
--Why were you not at the concert last night?
--I _______a close game between Seattle and Miami.
A. watched B. had watched
C. have been watching D was watching
药典中规定,簿层色谱法鉴别西洋参时,须用以下对照品()。
A.西洋参对照药材
B.拟人参皂甙F11
C.三七皂甙
D.人参皂甙RB.1
E..人参皂甙RE..Rg1