题目内容：

In 1869, the Smiley family purchased an area of land about 100 miles north of New York City. Over time, some of their property and much of the surrounding landscape became the Mohonk Preserve, which has since grown to 8,000 acres and attracts visitors and rock climbers.

But the Mohonk Preserve also has a long scientific legacy. In the 1930s, Dan Smiley, a descendent of the original owners, began keeping track of the plants and animals that lived in the area.

Megan Napoli is a research ecologist with the Mohonk Preserve in New York. She thinks Smiley’s efforts produced a rare long-term data set of observations, which is useful for studying the impacts of climate change. For instance, other research has shown that songbirds are migrating north earlier and earlier in the spring.

It's important for the birds to arrive at the proper time in the spring, because they need to time their arrival with the insect emergence. So they need to be here to establish their nesting sites, lay their eggs. Once the eggs hatch, they have their baby birds, so they need to time it when the insects are most abundant.

Napoli has begun analyzing about 76,000 observations of songbird migration dates collected by Smiley and his team to see if they, too, show that climate change has altered the timing of migrations. Her results suggest that they do.

Napoli found that short-distance migrants that spend their winters in the southern U. S. now arrive an average of eleven days earlier than they did in the 1930s. Long-distance migrants that overwinter in the tropics arrive roughly a week earlier. Napoli presented her results at a recent Ecological Society of America meeting in Portland, Oregon.

Meanwhile, who knows how many other long-term, personal data collections like Smiley’s are out there, waiting to be discovered and to help improve official attempts to track the planet’s changes.

1.What do we know about Dan Smiley?

A. He lived in New York City.

B. He was a scientific researcher.

C. He owned the Mohonk Preserve.

D. He kept a record of wildlife.

2.What does the underlined word “it” in Paragraph 4 refer to?

A. The birds’ birth.    B. The birds’ arrival.

C. The nest building.    D. The insect appearance.

3.What does Megan Napoli think of Smiley’s long-term record?

A. It has affected the birds’ migration.

B. It challenges the previous research.

C. It has changed official attitudes.

D. It is of great value to her research.

4.What can we learn from Napoli’s research?

A. It is totally based on Smiley’s long-term notes.

B. Scientists have to rely on more personal data.

C. Climate change affects birds’ migration time.

D. It contributes greatly to other personal research.