A、Cargo. B、Adults. C、Children. D、Chemical substance. D根据文中最后提到“...engineers predict,...could transport cargo...,...carry passeng

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问题  

选项 A、Cargo.
B、Adults.
C、Children.
D、Chemical substance.

答案D

解析 根据文中最后提到“...engineers predict,...could transport cargo...,...carry passengers...”,可知答案是D。
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