【例句】No one is able to get by without oxygen. 没有氧气人不能维持生命。【例句】This general store has just about everything you could wish for. 这家商店日用品应有尽有。
阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。Yellowstone National Park offers a variety of ranger programs throughout the park， and throughout the year. The following are descriptions of the ranger programs this summer.
