问题：
[单选题] Text 4 You might soon be able to sneak down to the cargo hold for a nap the next time you take an ultra-long fiight.That's the idea being fioated by plane manufacturer Airbus and seatmaker Zodiac Aero
A、they have to pay a lot.
B、they must fasten seat belts.
C、their safety is not guaranteed.
D、they can't look out ofthe window.
参考答案：
D、they can't look out ofthe window.
● 参考解析
