单选题 Issac Newton was a famous scientist (科学家). He (41) a-bout the laws of nature (自然界，本性) (42) than any other scientist in his time.
He learned by looking closely at things and by (43) hard. He was always in deep (44) .
(45) he was a wise (聪明的，明智的) scientist, he felt that he was never too old to learn. He thought (想) that what he knew was like a drop (滴) of knowledge (知识，知道) (46) .
He also said, "Man should not amuse (逗乐) (47) by finding a smooth (平滑的) pebble (鹅卵石) or pretty (漂亮的，相当) shell (外壳，泡弹) (48) a boy does. He must learn more by swimming (49) the sea."
The more you learn, the more there is (50) to be learned.

【正确答案】 C
【答案解析】根据上下文，以及常识，牛顿应该是knew about the laws of nature而不是heard。
【正确答案】 B
【答案解析】同上题的判断依据，应该选[B]more。
【正确答案】 C
【答案解析】study hard刻苦钻研，最符合牛顿的身份。
【正确答案】 B
【答案解析】空格应该填入一个名词或代词，thinking是动名词，符合题意。
【正确答案】 C
【答案解析】though表示转折、让步。
【正确答案】 A
【答案解析】what he knew was like a drop of know ledge sea。意思是他所知道的只不过是知识海洋里的一滴而已。
【正确答案】 A
【答案解析】这句话是牛顿的一句名言。这里应该填入与man相一致的 himself。
【正确答案】 C
【答案解析】as和like都有“像”的意思；但like是介词，后面只能接名词或代词。As是连词，后面一般接从句。
【正确答案】 A
【答案解析】in the sea，在海洋里。
【正确答案】 C
【答案解析】still，仍然。句子意思是说，你学到的越多，那么你要学的也就越多。