據(jù)最新估計(jì)，世界上至少有 500 億只野生鳥(niǎo)類。

Counting the number of wild birds in the world is no easy task. Scientists turned to a database, known as eBird, where birdwatchers record sightings of everything from woodpeckers to herons, to ospreys.

統(tǒng)計(jì)世界野生鳥(niǎo)類的總數(shù)并非易事?？茖W(xué)家們求助于一個(gè)名為 “eBird” 的數(shù)據(jù)庫(kù)，觀鳥(niǎo)者在數(shù)據(jù)庫(kù)記錄下觀察到的啄木鳥(niǎo)、鷺、鶚等鳥(niǎo)類的信息。

The researchers came up with an estimate of 50 billion individual wild birds currently living on the planet. That's about six birds for every human being.

研究人員們估計(jì)，目前生活在地球上的野生鳥(niǎo)類有500億只，相當(dāng)于地球人口的六倍左右。

The house sparrow tops the charts, followed closely by the European starling, the ring-billed gull, and the barn swallow.

其中，家麻雀數(shù)量位居榜首，緊隨其后的是歐椋鳥(niǎo)、環(huán)嘴鷗和家燕。

詞匯表

task 差事，任務(wù)
birdwatchers 觀鳥(niǎo)者
woodpeckers 啄木鳥(niǎo)
herons 鷺
ospreys 鶚，魚(yú)鷹
came up with 得出了
starling 椋鳥(niǎo)
gull 海鷗
swallow 燕子

閱讀理解：請(qǐng)?jiān)谧x完上文后，回答下列問(wèn)題。

1. Who are the people that record sightings of birds in the eBird database?

2. True or false? The study includes all birds on the planet.

3. How many wild birds are there for each human?

4. Which wild bird is the most common, according to the study?

答案  

1. Who are the people that record sightings of birds in the eBird database?
Birdwatchers record sightings in the database.

2. True or false? The study includes all birds on the planet.
False. It only includes wild birds, and not those in captivity.

3. How many wild birds are there for each human?
There are around six wild birds for every human.

4. Which wild bird is the most common, according to the study?
The house sparrow tops the charts.