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Book 4 Unit 3 参考答案 
1-5 ABBCA        6-10BAACC 
11-15 BACCB      16-20ACAAC 21-25 ADCDC     26-30 CBBDB 
31-35 DCABD    36-40 BECAF 
41-45 ACBAD 46-50CBDBD 51-55 ADCDB 56-60 BADDC 
61. them   62. a          63.making 
64. began      65. asked   66.to have 
67. which / that             68. ages 
69. is        70. or 
短文改错 
71. ... found a old ...    a→ an 
72. ... could tried it ...    tried→ try 
73. ... very hard as ...     very→ as 
74. ... so there was ...    so→ but / yet 
75. ... how play the ...     how后加to 
76. ... had been heard ...    去掉been 
77. Owen felt sadly.      sadly→ sad 
78. ... away while Grandma ... 
while→ when 
79. He smiled and ...  He → She 
80. ... your dad does ...     does→ did 
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书面表达 
One possible version: 
Mr. Smith had one lively son and he wantedto know how his height would change within one year. He thought hard andfinally had a good idea. He took his son to a tree and marked the spot whichhis son reached. 
Time went quickly by and winter came andwent. Then it was spring again. Mr. Smith took his son to the same tree andasked him to stand up straight. Looking at the marked spot, which was a littlehigher than his son, Mr. Smith was surprised. He wondered why his son was alittle shorter than he was last year. What he didn't realize was that the treehad grown faster than his son. 
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