问答题

北京2008年奥运会的重大意义 2．你能为北京奥运会做些什么 3．展望北京奥运会的前景 2008 Olympics and I

【参考答案】

2008 Olympics and I (1) It is well known that the Oly......

(↓↓↓ 点击下方‘点击查看答案’看完整答案 ↓↓↓)
<上一题 目录 下一题>
热门 试题

单项选择题
The major difficulty in developing space travel is that ______.
A．there is no clear destination in space
B．it is too risky and expensive for people to go beyond the orbit
C．the current space propulsion systems can not meet the needs for the long space travel
D．there is not enough energy for spacecraft to gain velocity
单项选择题
Which of the following is consistent with the passage
A．Current rockets are vulnerable and unstable.
B．New propulsion system has been developed.
C．People consider laser beams as a possible solution to developing new propulsion system.
D．At present, nuclear energies can be used in propulsion systems.
相关试题