题目内容：
根据材料，回答问题。Directions：There are lo blanks in the following passage．For each blank there are four choices marked A，B，C and D．Choose the ONE ansWer that best fits into the passage．Then mark the corre sponding letter on the Answer Sheet with a single line through the centre．
After ____20____ yearn of marriage，a husband may still not understand his wife.How is it that she is never at a ____21____ for words?How can she recall the names of a couple they met on____22____ years ago?Now we know what to tell him：It’s her brain．
Although there are obviously cultural 23 for the differences in emotions and behavior，recent breakthrough research reveals that the ____24_____ 0f many puzzling differences between men and women may lie mi the head．Men’s and women’S brains____25____much in common，but they are definitely not the Same in size，structure or insight．Broadly speaking，a woman’s brain，like her body，is ten to fifteen per cent smaller than a man’s， ___26____ the regions dedicated to language may be more densely packed with brain ceils，Girls generally speak earlier and read faster．The reason may be ____27____females use．both sides of the brain when they read．In contrast—males rely only on the left side．
At every age，women’s memories____28____men’s．They have a greater ability to associate names with faces than men do，and they are_____29____ at recalling list．The events。people remember best are those that an emotion is attached to． Since women use more of their right brains，which ____ 30____ emotions，they may do this automatically．
While we don’t yet know what all these findings imply，one thing is clear：male and female brains do the same things，but they do them differently．
21． A．slip
B．puzzle
C．loss
D．failure
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