下列现象中，不是生物对环境适应的是（ ）
A：北极熊白色的体毛
B：鱼的体型为梭型
C：牦牛的绒很保暖
D：孔雀开屏
有四盒包装“行唐大枣”，每盒以标准克数（1000克）为基准，超过的克数记作正数，不足的克数记作负数，以下数据是记录结果，其中实际克数最接近标准克数的是（ ）
Mum：Mary. ____
Mary：It's very pretty.
Assistant: ____
Mum：Yes. ____
Assistant：It's $ 99.
Mum：Oh， that's expensive.
Assistant：Do you like that blue skirt？
Mary：Yes. ____
Mum：OK. How much is it？
Assistant：It's $ 50.
Mum： ____
A. Can I help you?
B. OK. I'll take it.
C. How do you like this dress?
D. I like blue.
E. How much is it?
氯酸钾（KClO3）中，氯元素的化合价是（ ）
—It's ________unhealthy habit. Breakfast is very important to health.
世界上国家最多的大洲是（ ）
