阅读理解。 "I swear, I didn't steal anything!" I shouted over the alarm. Obviously the security guard didn't believe me because he seized the shopping bag right out of my hand. "Do you have a receipt for this?" he asked doubtfully, putting any new back-to-school outfit (全套设备) onto the dusty floor near the mall entrance. "Of course I do," I replied, fishing my wallet out of my coat pocket. Elsie and Monica, my two best friends,stood beside me. They were laughing their heads off! I almost tore my wallet apart for the receipt, but it had disappeared. "Let me look again," I said nervously.Then I looked again, and again, and again! My face was getting butter by the minute, and my heart was beatinglike a racehorse. Finally, I looked back at the guard and whispered, "It's not here." The guard picked up my clothes and said,"You'll have to come with me, Miss." When he opened the office door, I saw a man sitting behind a big metal desk. It was the manager. Then I had an idea. "May I say something?" I asked. "I can prove I didn't steal this thing." "Then I explained all about the cashier (出纳员). She said that she had bought the exact same outfit as a birthday present for her little sister." "We'll just see about that," the manager said and went off to find her. Ten minutes later, I was free! It was terrible to be unfairly accused of something! Then I remembered shouting at my sister that very morning for taking my new hair clips. Had she really taken them? I made a promise that day never to accuse someone of something without proof, and I haven't. At last something good came out of my terrible experience. 1. Why didn't the security guard believe the author? [ ] A. Because she looked nervous at that time. B. Because she had no money in her wallet.C. Because she didn't have a receipt for the outfit. D. Because her face turned red after being caught. 2. That the author's two friends laughed their heads off showed _____. [ ] A. they didn't believe the author B. they laughed at the author who stole things. C. they expected the author to be caught. D. they played a trick on the author. 3. We can infer the author was very _____ from the underlined part in Paragraph 4. [ ] A. careful B. nervousC. frightened D. excited 4. Who proved that the author hadn't stolen anything? [ ] A. The manager.B. The cashier. C. The author's friends D. The security guard. 5. From her experience, the author learned that _____. [ ] A. you should believe in yourself in face of difficultyB. it is a terrible thing to be suspected by friends C. you should ask for a receipt for whatever you buy D. you should not doubt others if you can't prove it