A:-43
B:56
C:-34
D:65
①消费对生产具有重要的反作用 ②交换决定着社会再生产的过程
③我国居民消费以享受性消费为主 ④新的消费热点带动相关产业发展
下列研究动物行为的方法中,属于实验法的( )
-- English is widely used all over the country.
-- Yeah, it is such ______ useful language that my grandma decided to buy ______ English-Chinese dictionary to learn it.