【正确答案】 A

【答案解析】[听力原文]
The most powerful earthquake to hit China in 30 years is feared to have killed thousands of people in the southwestern province of Sichuan. The official news agency Xinhua says more than 50,000 people may have died. [6] The authorities have launched a major rescue operation, but they are finding it difficult to reach victims because roads have collapsed.
Our correspondent Nick Mackie has just arrived near the epicenter, north of the provincial capital Chengdu, in the middle of the night, when it is 15itch-black, and there is no power at all in the town. Many of the buildings axe badly damaged, some Save collapsed and there were workmen and soldiers working away, trying to clear the debris from some collapsed bail, lings to see if there were people underneath.

[解析] 新闻中提到当局已经开始大规模的营救活动，但是由于道路坍塌，营救队伍很难进入震区。因此，A项正确。
[点睛] 事实细节题。听音重点是营救队伍难以进入震区的原因。选项B中房屋倒塌是营救队伍进入震区所看到的景象，因此错误；选项C在新闻中并未提及；选项D描述的是营救队伍进入震区后遇到的情况，因此也是错误选项。