单选题 Tens of thousands of diplomats, scientists, ecologists and ______ hangers-on are expected to gather in dozens of auditoriums for nearly 400 official and unofficial events.

【正确答案】 A
【答案解析】assorted组合的；各式各样的。obedient服从的；孝顺的。inaccessible难接近的；难达成的。coarse粗糙的；粗俗的。