题目

Rewrite the following sentences as required（根据所给要求，改写下列句子．）【1】You have never seen such a beautiful sunset．（改为一般疑问句）___ you___ seen such a beautiful sunset？【2】The first computers were built in the 1940s．（对划线部分提问）___ the first computers built？【3】It is uncertain．Will coffee cause problems with memory？（合并为一句）It is uncertain___ coffee___ cause problems with memory or not．【4】Shelley was so lucky that she won a free trip to Singapore．（改为简单句）Shelley was lucky___ to___ a free     如图，BD是∠ABC的平分线，DE//CB，交AB于点E∠A＝45°，∠BDC＝60°，求△BDE各内角的度数．