根据音标、词形变化或语境的提示，完成短文。

      “Sorry” is a word that people in Britain often say in their daily life.

      One day while I was ____(walk) on the street, a young man ran by hurriedly, brushing（轻擦）against my handbag. He continued his way, but turned  ____ /bæk / and said “sorry” to me. Even in a rush, he didn't ____ /fə'get / to say “sorry”. One day, after I bought some bananas, the shopkeeper was passing me the change, but I wasn't ready for it and a coin dropped onto the ground. “Sorry, Madam,” he said while bending to pick it up. I was  ____ (surprise) why he said “sorry” to me. Another time, I stepped on a man's foot at the entrance to a cinema. At the same time, we  ____ /bəʊθ / said “sorry”.

       Slowly, I got to know that when something unpleasant happens in daily life, the British don't care much ____ who is wrong. If someone is in trouble, a “sorry” is always ____ / 'nesəsəri /. Perhaps that is ____ /waɪ/ I seldom see people quarrel on the buses or streets in Britain.

铬是人体必需的微量元素之一，最近由于毒胶囊事件，引发人们对铬的关注。

(1)金属铬呈银白色，难溶于水，在空气中不易被氧化、耐腐蚀，在金属防锈上应用广泛。根据上述信息，写出金属铬的一种物理性质：____ 。

(2)含铬物质的毒性与铬元素(Cr)的化合价有关。已知CrCl₃中氯元素的化合价为-1，则CrCl₃中铬元素的化合价为 ____  。

(3)如图表示人体生理机能与必需元素含量的关系。若长期摄入铬超标的食品和饮用水，会导致人体生理机能从最佳区向 ____ 区移动，从而影响健康。

读“我国东部某地的等高线示意图”和“该地区的气候资料表”，图中等高线所示高度分别为100m、200m、300m、400m。综合分析后，回答题。

能被整除的算式有____ ； 不能整除的算式有____。