Question 1 is based on the news report you have just heard.

News Report One

听力原文

    A NASA satellite orbiting over Portugal took photographs that reveal the effects of pollution from ships. (1) [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 look like scars. 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 amount 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.

1. What has caused the thick clouds in the photos taken by a NASA satellite?

解析：A。根据录音开头可知，美国宇航局卫星拍摄的照片中显示了北大西洋上空的云层被一些较厚的线状云分隔开，随后美国宇航局官员解释说，这些较厚的云层是下方海面船舶往来的标志，也就是说厚云层的出现与下方海面的航运是直接相关的。A项中的ship traffic和Atlantic均为原词复现，故正确答案为A。

错项排除：录音后面提到了ocean（海洋）和particles（颗粒），但说的是当船舶驶过海洋时，它们会像汽车一样将废气排入大气，大量的废气颗粒会形成云层。录音中并没有提到warm currents和power plants，故B、C两项排除。录音中说，船舶会像汽车一样排放废气，废气中的颗粒达到一定程度会产生云层，D项利用cars和exhaust进行细节拼凑，但缺失关键信息ships，故D项错误。