He was well known for his works and humor．Everybody knows Mark Twain was a famous American writer．But before he was famous,even his neighbours didn't know him well．
One day Mark Twain went to borrow a certain book from a neighbor in Tarry town．
"May I borrow a book from you " he asked politely．"Yes．" the neighbor told him," but I must ask you to read it here．You know I never let anybody take my book out of my study（书房）．"
Some days later the neighbor wished to borrow Mark Twain's machine for cutting grass in the garden．
"May I borrow your machine to cut the grass in my garden?" the neighbor asked with a smile on his face．"Certainly．" Mark Twain told him,"but I must ask you to use it here． You know that I never let anybody take my machine out of my garden．"
答案是：b（American writer）,a（You know I never let anybody take my book out of my study）,c（ Mark Twain went to borrow a certain book from a neighbor）,b（May I borrow your machine to cut the grass）,b（排除法,其他三个都显然不对,而且只要对文章有足够的了解直接选也是可以选出来的!）