问题
单项选择题
实验证明甲药和乙药被同一拮抗药拮抗，且两药的pA2相近，则说明：
A．甲药和乙药是作用于同一受体拮抗药
B．拮抗药使甲、乙两药的最大效能减小
C．甲药可使乙药的量效曲线平行右移
D．甲药和乙药是作用于同一受体的激动药
E．甲药和乙药是作用于不同受体的激动药
答案
参考答案：D
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实验证明甲药和乙药被同一拮抗药拮抗，且两药的pA2相近，则说明：
A．甲药和乙药是作用于同一受体拮抗药
B．拮抗药使甲、乙两药的最大效能减小
C．甲药可使乙药的量效曲线平行右移
D．甲药和乙药是作用于同一受体的激动药
E．甲药和乙药是作用于不同受体的激动药
参考答案：D
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| Jim Green has been in China for more than two years. He has been to many interesting 1 in Beijing, but he has not yet been to many other parts of 2 . Last week he went to Mount Emei in Sichuan with his 3 . Many people like to travel by 4 , but the Greens think that travelling by train is the best. It is much 5 and far more enjoyable than a rushed journey by air. They had a won-derful train ride to Chengdu 6 they went on to Mount Emei by bus. The train was quite nice and tidy, and there weren't too many people in 7 sleeping car. The Greens could stand up and 8 around. It was a long journey, 9 none of them felt tired. They kept 10 the beautiful things out of the window. They talked, laughed and played cards. The conductor kept coming to give them hot water and 11 them newspapers. People nearby 12 with each other. A young man tried to speak English with Mr and Mrs Green. Jim thought the train was like a big moving party. He went to sleep quite 13 . He enjoyed listening to the sound of the running train and then fell asleep. When Jim woke up the next morning, the train was already 14 Chengdu. His train ride seemed really 15 , but his memory (记忆) of the pleasant journey will last long. | ||||
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