题目

下列关于“检测生物组织中的糖类和蛋白质”实验的叙述中，正确的是（ ） A . 待检组织检测之前应利用指示剂对标准溶液进行显色观察 B . 对获取的马铃薯研磨液直接滴加碘化钾溶液进行淀粉检测 C . 检测还原糖时，取2mL样液滴加5滴本尼迪特试剂后进行水浴加热观察 D . 检测蛋白质时，双缩脲试剂A和双缩脲试剂B等体积混合后加入样液中Scientists in Mexico have just begun a new study of one of the world’s biggest pyramids: the Pyramid of the Sun, north of Mexico City. They’re putting lots of small, high-tech machines under the pyramid to try to unlock some of its secrets. For thousands of years, people have tried to uncover the secrets of the pyramids. The people who built the pyramids made lots of secret doors and rooms to stop robbers from finding the treasures inside. However, there always have been some smart thieves in history. Now, almost all of Egypt’s pyramids have been robbed, including the Great Pyramid of Khufu, which is the largest pyramid in the world. It is the only one of the ancient wonders of the world that is still standing. In AD 820, an Arab king named Abdullah AL Manum got a group of workers to dig their way into the Great Pyramid and have a look. Inside the pyramid, they found three rooms --- the Queen’s Chamber, the Grand Gallery and the King’s Chamber. But to their surprise, the men didn’t find the treasures they wanted. The Queen’s and King’s Chambers were both empty! Where were the King’s mummy and his treasures? Had someone already taken them away? The huge stone doors at the pyramid’s entrance were still closed when AL Manum’s men went inside. How had the thieves got in and out? Since then, many people have gone inside the Great Pyramid to have a look or to try to take things. But still, no other chambers or walkways have been found. In 2002, an American team made the most recent visit to the Great Pyramid. Scientists sent a robot into the pyramid, but they only found a mysterious locked stone door.小题1:The first two paragraphs were written to show that ________.A．the Pyramid of the Sun is an unusual historic buildingB．ancient Egyptian emperors were cruelC．construction workers led a hard life in ancient EgyptD．the secrets of the pyramids remain to be uncovered小题2:What is the purpose of making some secret doors to the pyramids?A．To try to unlock some of its secrets.B．To stop robbers from finding the treasures inside.C．To refuse some visitors all over the world into it.D．To tell the truth to the people in the future.小题3:Which of the following is NOT true to the Great Pyramid of Khufu?A．It is the largest pyramid in the world.B．It is the only one of the ancient wonders that is still standing.C．Abdullah AL Manum took the King’s mummy and his treasures away.D．Scientists found a mysterious locked stone door to the Great Pyramid.小题4:What would be the best title for the text?A．The Pyramid of the SunB．The Great Pyramid of KhufuC．A Mysterious Locked Stone DoorD．Unlocking the Doors of History