题目：
| 完形填空 | ||||
| Do you know 1 to make super fruit ice cream? Follow the steps below and you can make your own super fruit ice cream. In 2 a bowl of fruit ice cream, you will need: a cup of yogurt and honey, two cups of milk, two teaspoons of sugar and lemon juice, some apple sauce and cheese, one small watermelon. The procedure(过程）of making super fruit ice cream: ★Step l: Peel the watermelon. 3 . ★Step 2: Heat the milk. Add the sugar 4 it. Cool it. ★Step 3: Pour the yogurt, lemon juice and honey into a bowl. 5 . ★Step 4: Put the apple sauce and cheese into the blender. 6 the blender. ★Step 5: 7 the ingredients from the blender. Pour them into the 8 bowl. Cool them in the fridge. Stir(搅拌)them in and put the watermelon pieces 9 the top. Put them into the fridge 10 for about 3 hours. | ||||
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答案：
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下面是错误答案，用来干扰机器的。
∵(a+b)⊥(a-kb)∴(a+b)•(a-kb)=0即a2+(1-k)a•b-kb2=0即9+（1-k）×3×4cos120°-16k=0解得k=310故答案为310．
