某一历史网站论坛中讨论新航路开辟的决定性因素，下面四个观点中最高明的是（　　）

MF⊥NF于F，MF交AB于点E，NF交CD于点G，∠1=140°，∠2=50°，试判断AB和CD的位置关系，并说明理由．

在我州独山大河口有一个地层断裂留下的世界级标准地质侧面，它将地质演化、运动的历史清晰地展现．这进一步印证了地质力学理论的科学性，请问地质力学的创建者是（    ）

    It was a Monday morning. When a teacher walked into the1, he heard a low voice: “Here is the teacher. I am 2this boring fellow(烦人的家伙) is going to talk about putting in commas(逗号).” It was a boy's3. His name was Bill. He was talking4the boy next to him. The teacher didn't get angry. He said5about it, then he really began to talk about putting in commas, and then he wrote6the sentence: “Bill says the teacher is a boring fellow.” The class7and Bill's face8red. “Now,” said the teacher, “I'll 9you how important commas are.”

    He put two commas in the sentence, and now read, “10is a boring fellow.”