63．The snake stone in the novel is .
(A)a stone with an address on it
(B)a clue left by the birth mother
(C)a gift from the swimming coach
(D)a fossil left by the foster parents

细节理解，用snake stone定位。可以看到两句话：第三段：The other characters in The Snack –Stone, James’s parents, his diving instructor, best friend, the villagers, people he meets on his journey, are pictured realistically.这句话对解题并没有用处。就再看到第四段的：The only clue he has is a fossil, “the snake stone” which she left behind along with a note on which she had written, “Take good care of Sammie.”他拥有的唯一的一个线索就是一个化石---她所留下来的“the snake stone”并且伴随着一张纸条，上面写着“照顾好Sammie”。故选择B.—一个由他的亲生母亲留下来的线索。