2022年普通高等学校招生全国统一考试英语（全国甲卷）听力注意事项：1. 答卷前，考生务必将自己的姓名、考生号、考场号、座位号填写在答题卡上。2. 回答选择题时，选出每小题答案后，用铅笔把答题卡上对应题目的答案标号涂黑。如需改动，用橡皮擦干净后，再选涂其他答案标号。
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.
高考英语语法独立主格结构学习指津例子引入：The country has already sent up three unmanned spacecraft, the most recent _______ at the end of last March.A.
