The surge in world grain prices in 2007 and 2008—and the threat they pose to food security—has a different, more troubling quality than the increases of the past.

2016年6月四级真题（第一套）阅读 Section B

The unpredictability of the real world may bring to the surface a troubling software problem.

2018年12月四级真题（第一套）阅读 Section C

But this vote of confidence in Oprah sends a troubling message at precisely the time when American universities need to do more to advance the cause of reason.

出自-2014年6月阅读原文

But at a time when the American factory seems to be a shrinking presence, and when good manufacturing jobs have vanished, perhaps never to return, there is something deeply troubling about this dilution of American craftsmanship.

出自-2013年6月阅读原文

It is also troubling that voting rates among our youngest eligible voters—18- to 24-yearolds— are way down: little more than one in four now go to the polls, even in national elections, compared with almost twice that many when 18-year-olds were first giv

2016年6月六级真题（第一套）阅读 Section B

Terrie Moffitt of Duke University and her research colleagues found that kids with self-control issues tended to grow up to become adults with a far more troubling set of issues to deal with.

2016年6月六级真题（第一套）听力 Section C

This is troubling as climbing Arctic temperatures combined with rapid sea ice loss are creating a new type of climate feedback loop, which could accelerate Arctic warming.

2018年12月六级真题（第二套）听力 Section B