2012年上半年,有媒体曾报道某品牌婴幼儿奶粉含有有毒物质,再次引发国人对食品安全体系的担忧。这一事件的出现,导致市场上国产婴幼儿奶粉价格下跌。这里引起价格下跌的原因是( )①生产婴幼儿奶粉的劳动生产率提高②消费者对婴幼儿奶粉的消费信心缺失③供求关系的改变④“毒奶粉事件”后,婴幼儿奶粉没有使用价值
— What languages ___ in that country? —German and English.
—Would you like an icecream,Diane?—No,thanks.I ____ eat them.They're bad for my teeth.
—Did you find the small village yesterday?—Yes,without any difficulty,for it has ________ changed over years.
Mrs Smith lives in such a big house without a child around.So she feels very ___.
This is 3-D printer. And this is an artificial (人工的) ear. Can you believe that scientists printed this artificial ear by this 3-D printer?