A、The strong winds. B、The inability of the rescuers. C、The damage to roads and local infrastructure. D、The lack of helicopters.

　　The destruction from the typhoon is massive and unprecedented according to the UN humanitarian officials who are helping to coordinate the relief. (5)Almost 10 million people have been affected and 660 000 displaced from their flattened communities. The UN has described the response in the Philippines government as very impressive, but clearly much more needs to be done on the ground. Response teams have focused on providing purified water, food, shelter and medical support for the survivors, (6) while an urgent priority is to bury dead bodies because of the risk of spreading disease.
　　(7)But the relief effort is being hampered by the damage to roads and local infrastructure. Our correspondent Jonathan Head is at the airport in Tacloban. He explained how the damage was affecting efforts to help survivors. "This airport is effectively cut off from the city. It’s taking people more than an hour to get between the two. So even when assistance is brought here, it can’t be given out. The airport has not received anything at all, because it’s still a very preliminary aid effort. "
　　5. How many people were left homeless?
　　6. What is the urgent priority?
　　7. What set obstacles to the relief effort?