被俄罗斯人称为“母亲河”且能“五海通航”的河流是（   ）

读《为学》，根据要求回答问题。

    下事有难易乎？为之，则难者亦易矣；不为，则易者亦难矣。人之为学有难易乎？学之，则难者亦易矣；不学，则易者亦难矣。

    吾资之昏不逮人也，吾材之庸不逮人也；旦旦而学之，久而不怠焉，迄乎成，而亦不知其昏与庸也。吾资之聪，倍人也，吾材之敏，倍人也；屏弃而不用，其与昏与庸无以异也。然则昏庸聪敏之用，岂有常哉？

    蜀之鄙有二僧：其一贫，其一富。贫者语于富者曰：“吾欲之南海，何如？”富者曰：“子何恃而往?”曰：“吾一瓶一钵足矣。”富者曰：“吾数年来欲买舟而下，犹未能也。子何恃而往!”越明年，贫者自南海还，以告富者，富者有惭色。西蜀之去南海，不知几千里也，僧富者不能至而贫者至焉。人之立志，顾不如蜀鄙之僧哉？

    是故聪与敏，可恃而不可恃也；自恃其聪与敏而不学者，自败者也。昏与庸，可限而不可限也；不自限其昏与庸，而力学不倦者，自力者也。

英译汉

A

    Once upon a time, there lived a teacher in a small town. He often taught his students in special ways. Once he sent four of his students to go to a small farm to see apple trees in different seasons. The first student went in winter, the second in spring, the third in summer, and the last in autumn.

    After the four students came back, the teacher called them together. They described their feelings to the teacher. The first student said that there were no leaves on the trees. It made him very disappointed(失望的). The second student said his eyes were full of light green. It made him feel hopeful. The third one disagreed. "What are you talking about? How pretty the trees were! The sweet smell(气味) of the beautiful flowers is everywhere." The last one shook his head. He only saw a lot of apples on the beautiful trees.

    The teacher smiled and told his students none of them were wrong. They each just saw one season. He continued, "The trees are not the same in different seasons. You can't judge(评价) a tree by only one season."

    Everything has different sides in our life. Don't hurry to make a conclusion(结论) before seeing the whole of it.

阅读短文，判断下列句子正误。