David believes that_______.
A.robots will be of more and more human characteristics
B.robotic toy industry will develop fast
C.scientists can learn from robot films
D.old people need to take care of robots at home
第6题
A.水田土壤中真菌较旱地土壤中多。
B. 熟化土壤中微生物数量较生荒土中少。
C. 耕作层土壤中数量最多,心土层中较少。
D. 酸性土壤中放线菌较多。
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