People have the belief ________ factories should produce fewer things from raw materials, ________ the supply is growing smaller and smaller.
A：which; that
B：which; which
C：that; whose
D：that; of which
为了适应环境，动物多采用____的抵御方法。
提取玫瑰精油的有关说法中正确的是（ ）
多肉植物鸡冠掌通常利用落叶上长出的不定芽繁殖，这种繁殖类型是（ ）
下列表述不正确的一项是（ ）
