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46、The author compares cells with water balloons in order to.


47、The word“arid”is closest in meaning to .


48、根据以下材料回答第 1～4 题：
Passage Four
It was almost two o’clock．A cold wind had come up over the take．As a black cloud moved across the sun，WaIt，a small boy，looked up．“I smell a storm(暴风雨)”，he thought．
Shorty，a man of forty，had gone into town．He had said he would be back before
tw0．He had told Walt to watch the boats and the shop．There were no people around．
They had all gone out on the lake to fish．
So Walt went to work on one of the boats．From there he could hear the telephone ifit ran9．And he could watch the door．
It was a little after two when the stranger came．Walt saw him stop by the shop．The
stranger looked in for a minute．Then he went down to the boats．He was a big inan in a coat．
Walt called to him，“Do you want something，sir?’’
The stranger looked at Walt and said，“NO，thanks．”Then the stranger moved slow-
ly away．As he went on，be looked at the boats one by one．
Wale sat there with his eyes on the back of the stranger’s coat．He tohought，“I cansmell something as I smell that storm．I hope Shorty comes back soon．”
The story happened ．




49、Walt stayed because ．


50、What do you think of Walt?


51、Which of the following is true?


52、根据以下材料回答第 1～5 题：
Passage Five
Many superstitious people are afraid of black cats．They believe that black cats have astrange power．If a black cat CrOSSeS their path，they think they will have bad luck．
Black cats haven’t always had such a bad reputation．Long ago，the Egyptians
thought that black cats were holy animals，They even worshipped them．Pasht was an
Egyptian goddess who had a woman’s body and a eat’s head．Because the Egypttans had somuch respect for black cats，they often buried the sacred creatures with great ceremony．Mummies of cats have often been found in ancient cemetery ruiDs．To keep the cats cornpany after they died，mice were sometimes buried beside them．
Feelings about black cats have always been strong．People have thought they were either very good or very bad．The people of Europe，in the Middle Ages，believed black catswere the evil friends of witches and Devil．Witches were said to have the power to ehane themselves into black cats．People believed that you could not tell whether a black cat wasj ust a cat，or whether it was a witch disguising herself as she plotted some evil scheme．The brain of a black cat was thought to be a main ingredient in witch’S brew．
Unlike their ancestors of the Middle Ages，Englishmen today consider black cats to begood luck charms．Fishermen’S wives often keep a black cat around SO that their husbandswill be protected when they are out at sea．
The Egyptian goddess Pasht had a ．



53、Judging from this passage，people of the Middle Ages probably ．


54、People of ancient Egypt and Europeans of the Middle Ages ．


55、“Sacred”means ．