完型填空。阅读下面短文,掌握其大意,然后从以下题所给的A、B、C、D四个选项中,选出最佳选项。
Peter’s job was to examine cars when they crossed the frontier to make sure that they were not smuggling anything into the country. Every evening he would see a factory worker coming __1__ the hill towards the frontier, __2__ a bike with a pile of goods of old straw on it. When the bike __3__ the frontier, Peter would stop the man and __4__ him take the straw off and untie it. Then he would examine the straw very __5__ to see __6__ he could find anything, after which he would look in all the man’s pockets __7__ he let him tie the straw again.