单项选择题

Argonne believes that people should regard maglev transportation as ______.

A．safe, efficient high-speed trains
B．the most exciting form of transportation for the future
C．a kind of aircraft
D．the most economical form of transportation

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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

The author mentions folding chairs in the first paragraph in order to ______.

A．settle a dispute
B．evaluate a claim
C．provide an illustration
D．point out a difference