听下面一段材料，回答第1至3题。 1. Which part of the plane is higher than 5
| 听下面一段材料，回答第1至3题。 |
| 1. Which part of the plane is higher than 5 stories? |
| [ ] |
| A. The head. B. The middle. C. The tail. |
| 2. How much does it cost to build such an airplane? |
| [ ] |
| A. At least $ 25 million. B. At least $ 400 million. C. At least $ 35 million. |
| 3. Why are the airplanes safe? |
| [ ] |
| A. Because there are many pilots. B. Because the engines have doubled. C. Because it is slow due to great size. |
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