3．A NASA-funded study used satellite to search for penguin poops （糞便） in Antarctica：funny at first sight though，it resulted in unique insights on the Adelie penguin's diet and its future as the climate changes.The findings published recently unlocked the secrets about the species that can provide an early-warning of threats to Antarctica's delicate ecosystem.
Researchers from Stony Brook University used satellite images to see if the Adelie penguin's diet has been changing in response to Antarctica's changing climate.Adelie penguin population has dropped greatly in some areas even as the global population increases.The satellite images cannot show the penguins individually，but their presence can be detected by the stain （污漬） left on the ice by their waste，called guano.
Male and female penguins take turns incubating （孵化） in the nest.The guano builds up in the same areas occupied by the nests.Heather Lynch，associate professor at Stony Brook，along with his team，used the area of the colony as defined by the guano stain to work back to the number of pairs.A global survey for Adelie penguins turned up 3.8 million breeding pairs.Also，the satellite data can detect the color of the penguin guano，ranging from white to pink to dark red.White guano is from eating mostly fish；pink and red would be from eating mostly krill（磷蝦）.The team found that while the Adelie penguin's diet did show changes from year to year，no consistent pattern was obvious.
"This was a big surprise，since the abundance and distribution of Adelie penguins has changed dramatically over the last 40 years and scientists had assumed that a change in diet might have played a role，" said Casey Young flesh，a graduate student from the university.However，continued changes in the physical environment and a growing krill fishery in the region are likely to have an influence on penguin prey（獵物）and penguin population itself. "Tools like this will be important for the management of the Antarctic ecosystem，which is often considered among the most primitive areas in the world，" said Young flesh.
（1）What concerned scientists most according to paragraph 1？
A．The climate change.
B．The Adelie penguin's diet.
C．The Antarctica's ecosystem.
D．The secret of penguin poops.
（2）How did scientists carry out the study？
A．By doing experiments.
B．By conducting surveys.
C．By making observations.
D．By collecting documents.
（3）Which of the following would Lynch agree with？
A．The Adelie penguin population was 3.8 million worldwide.
B．Guano colors reflected the health condition of the penguin.
C．The Adelie penguin's diet stayed the same most of the time.
D．Adelie penguin waste helped estimate the penguin population.
（4）What did Young flesh's words suggest？
A．More Adelie penguins have appeared over the last 40 years.
B．There was not an obvious changing pattern of penguin's diet.
C．Diet changes didn't actually affect penguin population as assumed.
D．Fishery was important for the management of the Antarctic ecosystem.
