下载APP
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Humans may not have landed on Mars (火星) just yet, but that isnt stopping a European company from devising a plan to send four people to the Red Planet within the next few years．(78)This project, calle...
A.
seven
B.
eight
C.
ten
D.
six