1. The author provides no evidence that the realism of color photography is the reason for its predominance.

出处：

结构：1)The author provides no evidence …

2) a is the reason for b

Many people think that the mobile phone will emerge as a central device in the digital future. South Korea, where more than three-quarters of the population have mobiles, provides good evidence for this. Many people already use their handsets for e-mail and even video-messaging—and 20% of them buy a new handset every seven months.(the Economist, “As good as it gets?”, January 15, 2005)

The strategy document acknowledges that reducing the space available to cars might increase congestion. But it says that recent research provides no evidence for this. It goes on to say that "to reduce car dependency, we must make the alternatives more attractive". The way to do this, it suggests, is to give more space to pedestrians as well as to cyclists and public transport.(the Economist, “Prescott’s long march”, October 16, 1999)

翻译：作者没有提出证据证明彩色照相的真实性是其(在市场上)占主导地位的原因。比较“A is scant evidence that …”和“The author provides no evidence that …”之间的细微区别。