10.The maximum ________ of the crane is 30 metres. (A)arm (B)length (C)reach (D)range

11.For Typhoon and the cyclone, which statement of the following is incorrect? (A)Normally, the affected area of Typhoon is smaller than the cyclone. (B)The cyclone exists in higher latitude than Typhoon. (C)Typhoon may develop at high latitude subject to the surface of seawater is cold enough. (D)Typhoon has no front but the cyclone has warm or cold front.