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2.计算下列几个式子，结果为 {#mathml#}$\sqrt{3}${#/mathml#} 的序号是{#blank#}1{#/blank#}

①tan25°+tan35° {#mathml#}$+\sqrt{3}${#/mathml#} tan25°tan35°，

② {#mathml#}$\frac{1+tan15°}{1-tan15°}${#/mathml#} ，

③2（sin35°cos25°+sin55°cos65°），

④ {#mathml#}$\frac{tan\frac{\pi }{6}}{1-ta{n}^2\frac{\pi }{6}}${#/mathml#} ．

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7.完形填空
    A man, who is now sixty-eight years old, went over-seas forty years ago. Just before they 1 , the girl he loved gave him as a souvenir, a heart-shaped knot（结）(symbolizing devotion) made of knitting（编织品） 2 . And he hung it on his belt 3. 
    Several years later he 4  and had children. His sweet-heart’s looks, 5 time went by, became dimmer（更模糊）and dimmer like a landscape picture 6 away gradually, and his homeland only appeared in his 7 . In the evening of his life he often looked at the knot and sighed. 
    One day, 8 the sight of the knot, his grandson9 getting hold of it as a toy. The boy touched it and tried to 10 it. At last he did the trick and got it 11and open. 
    When it was spread out, it turned to its form as a long 12, a very simple wool thread. Only by the clever 13of a beloved girl could the thread be knitted into such a complicated knot.14 love made so many simple things complex in the world. 
    The old man was thus 15 to a great truth. Most of the complaints, 16 and hatred in life result from very 17 matters . If one is 18 mindful of them, they become mental knots. But if one 19 the knot, it remains a simple thread or line, 20 shape it becomes.

8.完形填空
    A man, who is now sixty-eight years old, went over-seas forty years ago. Just before they 1 , the girl he loved gave him as a souvenir, a heart-shaped knot（结）(symbolizing devotion) made of knitting（编织品） 2 . And he hung it on his belt 3. 
    Several years later he 4  and had children. His sweet-heart’s looks, 5 time went by, became dimmer（更模糊）and dimmer like a landscape picture 6 away gradually, and his homeland only appeared in his 7 . In the evening of his life he often looked at the knot and sighed. 
    One day, 8 the sight of the knot, his grandson9 getting hold of it as a toy. The boy touched it and tried to 10 it. At last he did the trick and got it 11and open. 
    When it was spread out, it turned to its form as a long 12, a very simple wool thread. Only by the clever 13of a beloved girl could the thread be knitted into such a complicated knot.14 love made so many simple things complex in the world. 
    The old man was thus 15 to a great truth. Most of the complaints, 16 and hatred in life result from very 17 matters . If one is 18 mindful of them, they become mental knots. But if one 19 the knot, it remains a simple thread or line, 20 shape it becomes.

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