题目

如图所示，某一天然化学反应进行到 t1 时，加入一定量的酶，该反应在最适条件下进行直到终止。下列叙述错误的是 A.t1～t2 过程中会生成酶—底物复合物B.t2 时反应物浓度为零是因为反应物消耗殆尽C.适当升高反应温度 t2 会右移D.实验可以得出酶具有高效性的结论 答案：【答案】D【解析】由图可知，t1时加入酶，反应物浓度下降较快，说明酶加快了反应速率。A、t1～t2 过程中会生成酶-底物复合物，催化底物的反应，A正确；B、t2 时反应物消耗殆尽，故反应物浓度为零，B正确；C、图中曲线是在最适温度下进行的，故适当升高反应温度反应速率会减慢，t2会右移，C正确Witchcraft（巫术）was not made a capital offence in Britain until 1563 though it was disapproved by Pope Innocent VIII in 1484. From 1484 until around 1750, some 200,000 witches（女巫）were burnt or hanged in Western Europe.Most supposed witches were usually old women, and always poor. Any who were unfortunate enough to be an old woman with broken teeth, sunken cheeks and sockets and a hairy lip were assumed to possess the “Evil Eye”. It was more the case if they also had a cat. Many unfortunate women were taken away on this sort of evidence and hanged.Witch fever held East Anglia for 14 terrible months between 1645—1646. A man called Matthew Hopkins, an unsuccessful lawyer, contributed a lot! He became known as the “Witchfinder General”. He had 68 people put to death in Bury St. Edmunds alone, and 19 hanged at Chelmsfor in a single day. After Chelmsford he set off for other countries. Much of Matthew Hopkins theories of telling a witch were based on Devil’s Marks. He took a small mark to be a Devil’s Mark and he used his “needle” to see if these marks were insensitive to pain. His “needle” was basically a trick so the unfortunate women never felt any pain.There were other tests for witches. Mary Sutton of Bedford was put to the swimming test. With her thumbs tied to opposite big toes she was thrown into the river. If she floated she was guilty; if she sank, innocent. Poor Mary floated!Though many of the acts againsts witchcraft were put to an end in 1736, witch hunting still went on. In 1863, a suspected male witch was drowned in a pond in Headingham, Essex and 1945 the body of an elderly farm laborer was found near the village of Meon Hill in Warwickshire. His throat had been cut and his body was pinned to the earth. The murder remains unsolved; however, the man was said, locally, to be a male witch. It seems that belief in witchcraft has not entirely died out.1.A female witch was often found to be ________A. a young lady B. a lucky womanC. an ugly woman D. a blind girl2.Matthew Hopkins can be best described as __________A. kind and smart B. tricky and mercilessC. successful and nice D. famous and fortunate3.Why did people throw Mary into the river?A. To take her life.B. To tell if she was a witchC. To test her swimming skills.D. To prove that she was guilty4.What’s the main idea of the last paragraph?A. Witches are still badly treated all over the world.B. Witches were terribly treated in the European history.C. Some people still have been using magic in daily lives.D. There have always been people believing in witchcraft