2 . 听下面一段较长对话，回答以下小题。
1. Where are the speakers?

A．On a hill.

B．On a snow mountain.

C．On a volcano.

2. When did the bad earthquake happen?

A．10 years ago.

B．50 years ago.

C．100 years ago.

3 . It is always said that China is the homeland of tea, which has a very long history of tea.     1     However, unlike the western custom of using a convenient teabag, Chinese go to a lot of effort and time to prepare good tea for their guests, using tea leaves, natural spring water and a special kettle etc. to create worldwide famous tea culture. Tea is not just a drinkable beverage(饮料), but also a taste of Chinese traditional culture and inheritance(继承) of spirit. Unsurprisingly, there are various tea leaves in China.     2    

➢Color

    3     Good green tea leaves have jade green with fresh vitality. Twisted pan green tea shows glossy gray green. If some of the tea leaves have dry, dark and brown colors, it means it is old tea. If the leaves have mixed, large contrast colors, it is believed that the tea is mixed with yellow leaves, old leaves and even old tea, which does not live up to the standard of good tea.

➢Flavor(味道)

New tea is extremely clear and transparent with strong aroma(芳香), while old tea is characterized by brown color and weak fragrance. Take green tea and black tea for example, new green tea tastes a little bitter first, and then the fresh sweet taste begins to surface gradually, leaving a long and memorable after taste in mouth.     4    

➢Place of origin

There is great gap of quality among various places of origin.     5     For example, it is well-known that Yunnan produces the best quality Pu'er tea and premium Oolong tea can be found within Fujian Province.

A．Every tea leaf has its own shape.

B．Some varieties are identified by tightness of the leaves.

C．It is always advised to select tea from its main producing areas.

D．While you’re selecting tea, you should pay attention to following aspects.

E．For foreigners in China, drinking tea may seem like simple refreshment(提神).

F．Generally, new tea leaves look fresh and pleasing, with light green or dark green.

G．On the contrary, if bitter taste takes the lead and fresh sweet taste subsides(减弱), it is black tea.

4 . By the end of the century, if not sooner, the world’s oceans will be bluer and greener thanks to a warming climate, according to a new study.

At the heart of the phenomenon lie tiny marine microorganisms(海洋微生物) called phytoplankton. Because of the way light reflects off the organisms, these phytoplankton create colourful patterns at the ocean surface. Ocean colour varies from green to blue, depending on the type and concentration of phytoplankton. Climate change will fuel the growth of phytoplankton in some areas, while reducing it in other spots, leading to changes in the ocean’s appearance.

Phytoplankton live at the ocean surface, where they pull carbon dioxide(二氧化碳) into the ocean while giving off oxygen. When these organisms die, they bury carbon in the deep ocean, an important process that helps to regulate the global climate. But phytoplankton are vulnerable to the ocean’s warming trend. Warming changes key characteristics of the ocean and can affect phytoplankton growth, since they need not only sunlight and carbon dioxide to grow, but also nutrients.

Stephanie Dutkiewicz, a scientist in MIT’s Center for Global Change Science, built a climate model that projects changes to the oceans throughout the century. In a world that warms up by 3℃, it found that multiple changes to the colour of the oceans would occur. The model projects that currently blue areas with little phytoplankton could become even bluer. But in some waters, such as those of the Arctic, a warming will make conditions riper for phytoplankton, and these areas will turn greener. “Not only are the quantities of phytoplankton in the ocean changing. ” she said, “but the type of phytoplankton is changing.”

And why does that matter? Phytoplankton are the base of the food web. If certain kinds begin to disappear from the ocean, Dutkiewicz said, “it will change the type of fish that will be able to survive.” Those kinds of changes could affect the food chain.

Whatever colour changes the ocean experiences in the coming decades will probably be too gradual and unnoticeable, but they could mean significant changes. “It’ll be a while before we can statistically show that the changes are happening because of climate change,” Dutkiewicz said, “but the change in the colour of the ocean will be one of the early warning signals that we really have changed our planet.”

1. What are the first two paragraphs mainly about?

A．The various patterns at the ocean surface.

B．The cause of the changes in ocean colour.

C．The way light reflects off marine organisms.

D．The efforts to fuel the growth of phytoplankton.

2. What does the underlined word “vulnerable” in Paragraph 3 probably mean?

A．Sensitive.

B．Beneficial.

C．Significant.

D．Unnoticeable.

3. What can we learn from the passage?

A．Phytoplankton play a declining role in the marine ecosystem.

B．Dutkiewicz’s model aims to project phytoplankton changes.

C．Phytoplankton have been used to control global climate.

D．Oceans with more phytoplankton may appear greener.

4. What is the main purpose of the passage?

A．To assess the consequences of ocean colour changes.

B．To analyse the composition of the ocean food chain.

C．To explain the effects of climate change on oceans.

D．To introduce a new method to study phytoplankton.