题目

    Kidnappers are rarely interested in animals but they recently took considerable interests in Mrs Eleanor Ramsay’s cat. Mrs Eleanor Ramsay, a very wealthy but  41  old lady, has shared a flat with her cat, Rastus, for a great many years. Rastus leads a(an)  42  life .He usually takes a short walk in the evenings and is always home by seven o’clock. One evening, however, he  43  to arrive. Mrs. Ramsay got very worried. She looked everywhere for him 44  could not find him. She was  45  a loss, for there was nobody  46  whom she could turn for help.     Three day下列说法正确的是（　　）A. 生物体都是多细胞的 B. 凡是看不见的生物体都是单细胞的C. 单细胞生物比多细胞生物低等 D. 单细胞生物对人类都是有害的