下列不属于仿生的是
A.蝙蝠的回声定位与雷达
B.萤火虫与冷光
C.乌龟的背甲与薄壳建筑
D.真菌和藻类的共生
答案:D
真菌和藻类的共生,体现了生物间的共生关系,与仿生无关。
关于“商品—商品”这个公式的说法,不正确的是( )
A.等价物已经出现
B.是直接的物物交换
C.一般等价物已经出现
D.买和卖两种行为在同一时间和空间
I want to buy that kind of cloth because I _____ the cloth _____ well. [ ]
A. have told; washes
B. have been told; is washed
C. was told; washed
D. have been told; washes