单项选择题

According to the passage, when could people start using a maglev commerciaily

A．In 5 years.
B．In 10 years.
C．In 20 years.
D．In more than 20 years.
<上一题 目录 下一题>
热门 试题

单项选择题
The passage is mainly concerned with the ______.
A．geographical distribution of plant and animal species
B．location and purpose of the pulvini
C．appearance of the mimosa
D．process that causes movement in the mimosa
单项选择题
When did Amy Johnson become interested in flying
A．In 1923.
B．In 1930.
C．After she received a BA
D．After graduation from Yorkshire University.
相关试题