A NASA satellite orbiting over Portugal took photographs that reveal the effects of pollution from ships. One of the photos shows a thin film of clouds above the brilliant blue of the North Atlantic, cut by white lines of thicker clouds that looked like scars.
 1  NASA officials explained those thicker clouds are signs of ship traffic below. When ships power their way through the ocean, they pump exhaust into the atmosphere just as cars do. And those massive amounts of particles can cause clouds to form. Get enough of those particles in one place, as from the exhaust of a ship, and they can lead to the creation of new clouds, easily visible from space. These clouds can be huge. Some of them stretch hundreds of kilometers from end to end, NASA officials said.  2  It's likely that these sorts of clouds are having some effect on the global climate, according to NASA officials. But scientists aren't yet sure what effect it has.

环绕葡萄牙上空运行的一颗美国宇航局卫星拍摄到一组照片，揭示了船舶污染所带来的影响。其中一张照片显示，在北大西洋蔚蓝色的上空有一层薄薄的云，被犹如伤疤一样的白色厚云带切割开来。  1  美国航天局官员解释说，这些厚云层是下面船舶往来留下的痕迹。当船只快速穿过海洋时，它们会像汽车一样将废气排放到大气中。大量的微粒会导致云的形成。当足够多的粒子聚集（比如从船只排出的废气中）时，它们就可以产生新的云层 ，从太空中很容易看到。这些云层可能非常巨大。美国宇航局官员说，其中有些云层从一端延伸到另一端，长达数百公里。 2  据美国宇航局官员称，这些云层很可能正在对全球气候产生一些影响。但是科学家们还不确定是什么影响。

1.在美国宇航局卫星拍摄的照片中，是什么导致厚云层的产生？

A)大西洋的船只流量。

B)海洋中的暖流。

C)欧洲汽车排放的废气。

D)发电厂排放的微粒。

2.美国宇航局官员是如何看待这些厚云层的？

A)它们需要被严肃对待。

B)它们会对渔业产生很大的影响。

C)它们可能会给飞机航班带来麻烦。

D)它们可能正影响着全球气候。