问题
填空题
在△ABC中，AB=
|
答案
由∠B=30°，∠A=105°，
得到∠C=45°，又AB=
，2
则根据正弦定理
=AC sinB
得：AB sinC
AC=
=ABsinB sinC
=1．
×2 1 2 2 2
故答案为：1
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在△ABC中，AB=
|
由∠B=30°，∠A=105°，
得到∠C=45°，又AB=
，2
则根据正弦定理
=AC sinB
得：AB sinC
AC=
=ABsinB sinC
=1．
×2 1 2 2 2
故答案为：1
| 完形填空。 | ||||
| I became a gardener when I was twelve. My early 1 of gardening may not have originated from my love for nature. It was to 2 my parents. At that time, we had a big yard in which a beautiful maple tree stood. But my mother often looked with 3 at this work of natural art. Those golden leaves seemed like tons of rubbish her, "something else to 4 !"Seeing the neighbors busy with gardening, my father ever thought it a waste of time. At that age, I always did something 5 to whatever my parents did! If gardening were something they found 6 ,I would plant a garden! I planted some lily (百合花) seeds in the yard. But they failed to 7 . I continued to sunflower seeds and roses, Wild 8 joy, I found the first rose bloom(开花).One by one, the flowers bloomed their heads off. 9 , I was touched by this land of wonder. 10 , my parents showed no interest in my garden. My father even 11 at me because found it was 12 to move around my garden to the driveway. To my mother's 13 , I put her vase my real roses which, in her eyes, were simply weeds 14 flowers. Regardless of their 15 , I kept on planting my garden and 16 to enjoy the pleasure gardening. Plants make such good companions: they breathe, they bloom,they 17 to care and love. It has been many years since I made my first garden out of my desire to 18 my parent .Today I become known as Mrs. Greenthumbs, teaching gardening and hosting a gardening show which makes my parents feel very 19 . And now I could say it is my affection for 20 that makes me a real gardener. | ||||
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