Question 4 is based on the news report you have just heard.

听力原文：

    It’s not your imagination: Traffic in the U.S. is actually getting worse. (3) Americans drove more miles last year than any other year on record. The US department of transportation says Americans drove nearly 3,150 billion miles last year. That’s about the same distance as 337 round trips from Earth to Pluto. The previous record was 3,003 billion miles in 2007, before the economic recession and high gas prices.

    The traffic increase comes at the same time as gas prices drop significantly. The current average gas price in the U.S. is $1.71 per gallon. A year ago, it was $2.31 per gallon and was often much higher in recent years. A transportation expert told the reporter that the job growth likely plays a part as well, along with some people driving longer distances to and from work.

    And so, all this means more traffic jams on the road. (4) The Taxas A&M Travel Institute found that rush-hour travelers spent an extra 42 hours on the road last year because of travel delays. Now, that is depressing.

4. What is depressing according to the speaker?

解析：D。本题为细节题。问题为：讲话人认为令人沮丧的是什么？根据原文“The Taxas A&M Travel Institute found that rush-hour travelers spent an extra 42 hours on the road last year because of travel delays. Now, that is depressing.”，可知令人沮丧的是，由于交通堵塞造成的延误（travel delay）导致高峰期出行者在路上多花42小时（extra 42 hours），也就是说高峰期交通状况恶化，D选项“Rush-hour traffic is worsening.”与原文信息一致，为正确答案，其他选项与原文信息“油价下降，就业增长，通勤增多”不符，排除。