单选题
单选题已知三角形的两个顶点是椭圆C：的两个焦点，第三个顶点在C上，则该三角形的周长为（ ）
单选题已知平面向量＝（1，1），＝（1，－1），则两向量的夹角为（ ）
单选题地震前自然界出现的与地震孕育有关的现象称为地震前兆。我国古代人民早就认识到地震是有前兆的，并留下了关于地震前兆丰富的记载。例如，1739年宁夏银川地震后，有人就总结出地震与井水变化、动物不安、天气反常现象之间可能存在某种联系。古书《隆德县志》上也记载了古人总结的六种地震前兆现象。现代地震科学的深入研究则表明，地震之前确实存在多种多样的前兆。 人的感官能直接觉察到的地震前兆称为地震的宏观前兆。比较
单选题阅读下列短文，然后根据短文的内容从每小题的四个选择项中选出最佳的一项。C "Troublemaker" was what was given to my friend Peter by his teachers.They also said that he had no future and no hope! But now I suggest that anyone who said that
单选题阅读下列短文，然后根据短文的内容从每小题的四个选择项中选出最佳的一项。D Welcome to North Road Medical Cendive! We are open from 8:30 a.m.until 6 p.m.Monday to Friday.Appointments（预约）with the doctors and nurses are accepdiv both mornin
单选题依次填入下面横线处的句子，顺序最恰当的一项是（ ）左边是园，右边是园。是塔是桥，是寺是河，是诗是画，是石径是帆船。左边的园修复了，____。有客自海上来，____。塔更挺拔，____，寺更幽凝，____，____，____。
单选题通读下面的短文，掌握其大意。然后，从每小题的四个选择项中选出可填入相应空白处的最佳选项。In nearly every town or city cendive in the UK, on most days of the week you can find one or more people standing in the sdiveet selling a magazine 21 The B
单选题阅读下列短文，然后根据短文的内容从每小题的四个选择项中选出最佳的一项。B Magic（魔法）often forces us not to believe our own eyes or even appears to be breaking laws of physics or nature! The word "magic" has many different meanings.When a
单选题通读下面的短文，掌握其大意。然后，从每小题的四个选择项中选出可填入相应空白处的最佳选项。In nearly every town or city cendive in the UK, on most days of the week you can find one or more people standing in the sdiveet selling a magazine 21 The B
单选题通读下面的短文，掌握其大意。然后，从每小题的四个选择项中选出可填入相应空白处的最佳选项。Eleanor Roosevelt was the wife of America’s 32nd president, Franklin Roosevelt.She helped her husband in many ways during his long21 life.She also became on
单选题（ ）
单选题抛物线y²＝3x的准线方程为（ ）
单选题These books should not be ____ from the library.（ ）
单选题设函数f（x）＝，则f（x－1）＝（ ）
单选题通读下面的短文，掌握其大意。然后，从每小题的四个选择项中选出可填入相应空白处的最佳选项。In nearly every town or city cendive in the UK, on most days of the week you can find one or more people standing in the sdiveet selling a magazine 21 The B
单选题在1＋2x8的展开式中，x2的系数为（ ）
单选题通读下面的短文，掌握其大意。然后，从每小题的四个选择项中选出可填入相应空白处的最佳选项。In nearly every town or city cendive in the UK, on most days of the week you can find one or more people standing in the sdiveet selling a magazine 21 The B
单选题（ ）
单选题