选字填空。

              竞       竟       境

①保护环____，人人有责。

②想不到外祖父____像小孩子一样，“呜呜呜”地哭了起来。

③游泳健儿____渡昆明湖。

              玷       惦       踮

④他个子小，得____着脚尖才能看见。

⑤外祖父训斥我妈：“孩子要管教好，这清白的梅花，是____污得的吗？”

⑥母亲十分____念在外地工作的弟弟。

72 94 62 96 52 100 94 83 92 94

85 90 96 69 61 89 84 100 78 80

95 75 100 100 99 89 91 99 82 89

93 95 86 94 76 92 95 78 95 89

99 97 79 83 100 100 96 95 88 96

整理上面数据，并填写下表．

____

--- When is your birthday?  --- It's _____ September.  

    A marine biologist placed a shark into a large holding tank and then released several small bait fish into the tank. The result met your 1, the shark quickly swam across the tank, attacked and ate the smaller fish.

    The biologist then 2a strong piece of fiberglass into the tank, creating two 3parts. She then put the shark on one side of the 4fiberglass and a new set of bait fish on the other. 5, the shark quickly attacked. But this time, the shark 6because it knocked hard against the fiberglass 7. Determined, the shark kept 8this behavior every few minutes, but 9. Meanwhile, the bait fish swam around 10in the second part. Eventually, the shark 11hope of hunting. This experiment was carried out several times. Each time, the shark got less 12and made fewer attempts to attack the fish, until it 13hitting the fiberglass and simply stopped attacking. The biologist then 14the fiberglass, but the shark didn't attack. The shark was trained to believe a 15existed between it and the bait fish, 16the bait fish could swim wherever they wished, free from harm.

    Many of us, after experiencing setbacks and failures, 17give up and stop trying. Like the shark in the story, we believe that 18we were unsuccessful in the past, we will always be unsuccessful. 19, even when no "real" obstacle exists between where we are and where we want to go, we 20see obstacles in our heads.