根据课文《金鸟》填写下面句子中的空缺部分。
_______他让这只漂亮的鸟留在平常的木笼子里,那真是太可笑了, _______他打开笼子门,把金鸟放到金笼子里。
如果、于是
用典型暴雨同频率放大推求设计暴雨,则()。
A.各历时暴雨量都不等于设计暴雨量
B.各历时暴雨量都等于设计暴雨量
C.各历时暴雨量都大于设计暴雨量
D.不能肯定
The United States is well-known for its network of major highways designed to help a driver get from one place to another in the shortest possible time. (51) these wide modern roads are generally smooth and well maintained, with (52) sharp curves and many straight sections, a direct route is not always the most (53) one. Large highways often pass by scenic areas and interesting small towns. Furthermore, these highways generally (54) large urban centers which means that they become crowded with heavy traffic during rush hours, (55) the "fast, direct" way becomes a very slow route.
However, there is almost always another route to take (56) you are not in a hurry. Not far from the (57) new "super highways", there are often older, less heavily traveled roads which go through the countryside. (58) of these are good two-lane roads; others are uneven roads curling through the country. These secondary routes may go up steep slopes, along high cliffs, or down frightening hillsides to towns (59) in deep valleys. Through these less direct routes, longer and slower, they generally go to place where the air is clean and the scenery is beautiful, and the driver may have a (60) to get a fresh, clean view of the world.
55()。
A. when
B. for
C. but
D. that