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и (tng)ԇ^c(din)M}Ľ}

l(f)r(sh)g:2017-09-12݋ٱ

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Why does the professor mention a merchant who ate tulip bulbs?

Why does the professor explain the design of a pedestrian mall?

Ҋ(jin)ķʽWhy does the professor mention…? ʲôڕ(hu)ᵽ…?

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Why does the professor mention a merchant who ate tulip bulbs?

@tulip bulbs҂͵иԇ (tng)tulip bulbsF(xin)λô҂Ҫҵ^c(din)ҲǴ𰸾@(g)ӵǰһ(li)f(shu)ӵǰʲô҂Ҫҵ^c(din)ӵ܇??yn)ᵽ@(g)ӾǞf(shu)@(g)^c(din)

҂w(li)@(g)TPO6 L1ᵽ

For the Europeans, tulips were totally unheard of, uh…a great novelty. The first bulb to show up in the Netherlands, the merchant who received them roasted and ate them. He thought they were kind of onion.

Why does the professor mention a merchant who ate tulip bulbs?

A. to explain how the Turks introduce the flower to European visitors

B. to explain what happened to tulip bulbs that did not produce desirable colors

C. to give an example of one way that the rich in the Netherlands showed off their wealth

D. to illustrate her point that Europeans were unfamiliar with the flower

D

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@Ҋ(jin)һN^c(din)M}

и (tng)^c(din)M}

BҊ(jin)һN^c(din)M}ҲWhy does the professor mention…?@һ֮⡣҂߀һɚw^c(din)M}DZ}}e(li)f(shu)

TPO1 L2

Uranium-Lead Dating allowed them to go about it in an entirely different way. What they did was: they looked at the grains of Zircon in the sandstone. Zircon is a material that contains radioactive Uranium, which makes it very useful for dating purposes.So if you measure the amount of Lead in the Zircon grain, you can figure out when the grain was formed. After that, you can determine the age of Zircon from different mountain ranges. Once you do that, you can compare the age of the Zircon in the sandstone in your sample to the age of the Zircon in the mountains. If the age of the Zircon matches the age of one of your mountain ranges, then it means the sandstone actually used to be part of that particular mountain range.

In the talk, the professor describes the sequence of uranium-lead dating. Summarize the sequence by putting the events in the correct order.

Drag your answer choices to the spaces where they belong. To remove an answer choice, click on it.

Zircon in the sandstone in matched to the zircon in a particular mountain range

The amount of lead in sandstone zircon is measured

The age of zircon in a sandstone sample is determined

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