SanLu Group made toxic baby milk to make great profit, which is unethical and illegal.

A . A．Ag--(Ab-B)--A* B . B．Ag--(Ab-B)--A-B* C . C．Ag--(Ab-B)--AB*C D . D．Ag--Ab1--(Ab2-B)--A* E . E．Ag--Ab1--(Ab2-B)--A-B*

A . 以游离亲和素作为桥联剂 B . 用酶蛋白标记生物素 C . 用生物素标记抗体分子 D . 用亲和素标记抗体 E . 亲和素分别与生物素化抗体和酶标生物素结合

A．原料处理 B．净化处理 C．供电系统 D．生产设备

Using placebos to test drugs sometimes has a surprising result. Researchers say people taking the placebo often report improvements in their health. This is known as "the placebo effect"--pain that is eased or stopped by an inactive substance. In such testing, the drug must perform. better than the placebo to prove that it is effective. Doctors have reported that the placebo effect can be used in treatment. For example, a doctor tells a patient that a new drug will stop the pain in his leg. The pill is only sugar. But the patient does not know that. He takes the pill and says his pain is gone. Scientists are beginning to discover some physical reasons for this reaction in some people. They are learning that much of what people believe to be true comes from what the brain expects is going to happen. If the brain believes a drug will ease pain, the brain may begin physical changes in the body that can cause the expected effect. A recent examination of studies on drugs for depression found that placebos eased the depression about as well as the active drugs. Other studies have explored the power of placebos. A study in Japan involved thirteen people who reacted to the poison ivy (常青藤)plant. Poison-ivy causes red itchy sores(伤痕)on some people who touch it. Each person was rubbed on one arm with a harmless leaf, but was told it was poison ivy. Each person was then touched on the other arm with poison ivy, but was told it was a harmless leaf. All thirteen people developed a reaction on the arm where the harmless leaf touched their skin. Only two reacted to the poison ivy leaves. Doctors and scientists worry that the use of placebos may not always be harmless. They say people can become victims of false doctors and others who use placebos to claim they can cure disease. What do medical researchers usually use to make placebo pills？ A．Ivy leaves. B．Harmless leaves. C．Medicine being tested. D．sugar.

A．三角形行程指示器的长竖直边应在行程标志牌的制动标志孔范围内 B．三角形行程指示器部分或全部遮挡行程标志牌的缓解标志孔 C．外套筒上的黄色行程指示器尾端应在伸缩杆上的红色（第三道凸环）、绿色（第二道凸环）行程标志环带内 D．黄色行程指示器尾端应在伸缩杆上的白色缓解标志环带（第一道凸环）内

A．2 B．10 C．6 D．15