It would appear from the text that avalanches are formed because______.
A.a particular section of snow is not thick enough
B.there is a slight fall in the temperature
C.heavy snowfalls turn into rain
D.the ice between different sections of snow melts
26-28Questions 26 to 28 are based on the passage you have just heard.
第26题:
根据下列选项回答 26~35 题:
第 26 题 the climate affects the future sustainable agricultural development?__________