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句意：一本好书就是一个好的朋友，因为它能帮助你。
根据文章第三段：A good book is like a good friend. It will share some new ideas that you have never heard before. When you are sad, a good book will make you feel relaxed. You' ll never feel lonely, as long as you own a good book. A good book is really helpful.（一本好书就像一个好朋友。 它将分享一些你从未听说过的新想法。 当你悲伤的时候，一本好书会让你感到放松。 只要你有一本好书，你就永远不会感到孤独。 一本好书真的很有帮助。）可知本句描述正确。
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