025.
Attention please, ladies and gentlemen. Our bus is getting close to Cambridge, where we'll be stopping to eat. We'll have our lunch in the garden of a restaurant overlooking a small park that reminds people of a very famous tree. It's said that General George Washington took command of the army in 1775 under its very branches. It was almost 100 years later, in 1864, that the city of Cambridge celebrated the event and from that moment on, the tree was called the Washington Elm. Later the tree was attacked by insects and were counted to find out how old the tree was. Well, it seems that if Washington had accepted the command of his army under this tree, he must have done so on his knees. This particular elm couldn't have been over 3 or 4 years old in 1775. It is a well-known fact that Washington took command under an elm tree, but unfortunately it couldn't have been the famous Washington Elm.
Well, enjoy your lunch. Watch your step as you leave the bus.

答案解析：
(1) 正确答案为B。根据ladies and gentlemen.女士们先生们；以及Our bus is getting close to Cambridge我们马上就要抵达剑桥了。可知，说话者为导游，因此B项正确。
(2) 正确答案为A。根据overlooking a small park that reminds people of a very famous tree. 俯瞰这座小公园会使人想起一棵非常著名的树。可知，说话者主要介绍了一棵有名的树，因此A项正确。
(3) 正确答案为C。根据如果华盛顿在这棵树下接受了他的军队的司令(职务)，他必定是跪着完成的。可知，华盛顿不可能是在树下接受的职务，因此C项正确。
(4) 正确答案为A。根据the tree was attacked by insects这棵树遭遇了昆虫的袭击，因此A项正确。