加灣鼠海豚是世界上最稀有的海洋哺乳動(dòng)物。一項(xiàng)基因研究顯示，這個(gè)瀕危物種仍有望免于滅絕，盡管野生的加灣鼠海豚總數(shù)只剩 10 來(lái) 頭。

The tiny, silvery porpoise known as the vaquita is facing an existential threat from becoming entangled and killed in fishing nets. And with fewer than a dozen vaquitas left in waters off the coast of Mexico, time is running out to save the species.

這種被稱(chēng)作 “加灣鼠海豚” 的小巧銀色鼠海豚正面臨被漁網(wǎng)纏住致死的生存威脅。墨西哥海岸附近的水域中只剩下不到12頭加灣鼠海豚，拯救這一物種的時(shí)間不多了。

But now a glimmer of hope. A study of DNA samples obtained over the past few decades suggests the animals are naturally genetically fitter than expected for such a small population and should be able to bounce back from extinction.

但現(xiàn)在，加灣鼠海豚仍有望免于滅絕。一項(xiàng)對(duì)過(guò)去幾十年來(lái)獲得的基因樣本進(jìn)行的研究表明，對(duì)數(shù)量如此稀少的種群來(lái)說(shuō)，加灣鼠海豚的基因比預(yù)想得更健康，因此數(shù)量應(yīng)該可以回升，從而免于滅絕。

The researchers, based in California, say we now face a choice either to enforce protection measures to save the vaquita or watch the last of the kind die out.

總部位于加利福尼亞州的研究人員說(shuō)，我們現(xiàn)在面臨一個(gè)選擇：要么采取保護(hù)措施拯救加灣鼠海豚，要么眼睜睜地看著最后一頭滅絕。

詞匯表

silvery 銀色的
existential 關(guān)乎生死的
entangled 被纏住
dozen 十二，一打
extinction 滅絕
measures 措施

閱讀理解：請(qǐng)?jiān)谧x完上文后，回答下列問(wèn)題。

1. What does the vaquita look like?

2. What things are threatening the survival of the vaquitas?

3. How many vaquitas are left in the waters off the coast of Mexico?

4. What did DNA samples reveal about the vaquita?

答案  

1. What does the vaquita look like?
The vaquita is tiny and silver-coloured.

2. What things are threatening the survival of the vaquitas?
Getting trapped and dying in fishing nets.

3. How many vaquitas are left in the waters off the coast of Mexico?
Less than a dozen.

4. What did DNA samples reveal about the vaquita?
For such a small population, they are genetically fitter than expected.