已知x﹣9的平方根是±3，x+y的立方根是3．

①求x，y的值；

②x﹣y的平方根是多少？

图为肾蕨，据图回答（中填写图中数字）：

（1）图中的地上部分是____ ____，地下部分是____ ƒ____和____ ____ ．

（2）成熟的孢子囊内有____  它与肾蕨的繁殖有关，因此，肾蕨属于____ 中的蕨类植物．（选填“孢子植物”或“种子植物”）

    A beggar was sleeping in the doorway of a fruit shop. The shop owner felt angry. He walked up to him and 1 him to go away in a rude manner, but the beggar did not seem to2 him and lay still there. The shop owner got much3, shouting that he was a beggar in disguise (假装) and4 cheated passers-by for money by making use of their kindness. At that time, it was the busiest moment of a day and the market was5with shoppers. They all blamed the beggar for6. Showing fear, the beggar7his face in an old blanket. What he received was bitter8rather than help.

    The next morning, it was drizzling. An old man, who went to the market early, found the beggar 9on the ground. He woke the beggar up and 10 asked whether he was cold or not, but the beggar made no 11. Then the old man12his hands gently, saying that they felt13. With these words, he ran home in a hurry, returned with a pile of14, picked out a sweater and urged the beggar to15 it on again and again. Seeing what happened, many other passers-by surrounded the beggar and gave him change one after another, showing16for him. It was not long before the beggar received a handful of 17.

    In many cases our behavior may have a great18 on the people around us because they are likely to19us. Therefore, we should pay special attention to what we do and say, trying to infect others with positive words instead of 20 ones.

用氯化钠固体和蒸馏水配制100g10%的氯化钠溶液，不需要的实验仪器是（）