Argonne believes that people should regard maglev transportation as ______.A.safe, efficie

nt high-speed trainsB.the most exciting form. of transportation for the futureC.a kind of aircraftD.the most economical form. of transportation

提问人：网友lovemyqq 发布时间：2022-01-06

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更多“Argonne believes that people s…”相关的问题

第1题

1. Instead of using mechanical methods, Maglev is a system of transportation that uses magnetic levitation to suspend, guide and propel vehicles from magnets.

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第2题

Which countries have probably spent the most money on maglev research？

A．France and West Germany.

B．Japan and West Germany.

C．the United States and Japan.

D．West Germany and the United States.

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第3题

Perhaps the most familiar plant movement belongs to one species of mimosa called the sensitive plant. Within seconds, it can lower its leaves and make its tiny leaflets close up like folding chairs. This movement is thought to be initiated by electrical impulses remarkably similar to nerve signals in animals. But without the animals' sophisticated motion machinery, the mimosa has had to be creative in devising a way to move.

For motion, the plant depends on tiny, bulb-shaped organs located at the base of each leaf stalk and leaflet. Called pulvini, these organs hold the plant parts in place. When the mimosa is stimulated—say, by a crawling insect or a sudden change in temperature—an electrical impulse sweeps through the plant. This causes potassium and then water to be shifted from certain cells in the pulvini to others, quickly turning one side of the organs flaccid. Because the pulvini can no longer support the leaves and leaflets, this shift results in a corresponding change in their position.

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

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第4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