阅读理解。 They say there are three ways to experience the Grand Canyon; on foot, on mules (骡子) or by air. We chose the first. Up early, my husband and I and our three children couldn't wait to get started. We decidedto walk along a lovely path named Bright Angel Trail. As we set out, I was shocked at how narrow the path was. And I couldn't help noticing that the other tourists weren't like us. They had heavy backpacks, water bottles, and hats. But as usual we were dressed.As the sun rose higher, Arizona's famous heat seemed to roast us. There was no shade and our legs wereaching. We decided to go back, with the girl on my back and the boys far behind. By the time we finally gotback, our legs were like jelly. The next day, after we'd had a long rest and a good breakfast, we were ready for another view of the Canyon-by air. After our last walk, this would be the easiest thing in the world. We called to each other excitedly as the plane took off and circled around the Canyon. But the smiles on our faces disappeared as the pilot tossed (翻转) the plane around, pretending he was going to hit the ground.I shouted, "STOP, TAKE US BACK!" When we finally arrived back on land, once again our legs were likejelly. We hardly spoke as we drove back. As I said, there are three ways to view the Grand Canyon. We never tried the mules, but personally I'd suggest a fourth: buy yourself a good magazine like National Geographic. That way, you can see the Canyon, without fear or tiredness. 1. Which of the following is true according to the second paragraph? [ ] A. They made a careful preparation before the trip. B. The children were more joyful than their parents. C. Bright Angel Trail was not as lovely as they expected. 2. The underlined expression "Our legs were like jelly" probably means _____. [ ] A. we were weak B. we were unhappy C. we were dissatisfied D. we were disappointed 3. Which of the following best describes their Canyon trip by air? [ ] A. It proved to be frightening. B. It was more comfortable.C. It turned out to be exciting. D. It made each of them tired. 4. We can infer from the passage that _____. [ ] A. experiencing the Canyon on mules would be the best way. B. one needs to dress less when visiting the Grand Canyon. C. the writer was not serious when she made the suggestion. D. the whole family narrowly escaped from the air accident.