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8. Japan is known for the land of the cherry blossom(樱花) because of in the spring of the year the cherry trees are so beautiful. (1) for→ as 因be known as…表示“被称为，作为……而著名”，be known for…表示“因……而著名”，be known to sb.表示“为某人所熟知”。 (2) 去掉because后的of 因为其后是句子，要用连词because，而because of 是短语介词，其后不能接从句(what he said之类的从句除外)。 9. As is known by all, the Internet is playing a more and more important part on our daily life. (1) by→ to 因为As is known to all(众所周知)是固定词组。 (2) on→ in 因play a part in sth.(在……中起作用)也是固定词组。 10. Under his help, I have made rapid progress and caught up the class. (1) Under→ With 表示“在某人的帮助下”，用with sb.’s help = with the help of sb.来表达。 (2) 在caught up后加with 因catch up with是表示“赶上”的固定词组。 介词 熟读深思 Born in［1］Peking, Yuan Longping graduated from［2］ Southwest Agricultural College in China in［3］1953, and since［4］his graduation he has devoted himself to［5］agricultural education and research. His pioneering research has helped rid China of［6］hunger within［7］three decades. In 1973, in［8］cooperation with others, he was able to cultivate a type of hybrid rice species which had great advantages over［9］others and whose output would increase by［10］20 percent than that of common ones. | 
