问题
选择题
设x、y为实数，且y=4+
|
答案
根据题意，y=4+
+5-x
有意义，x-5
而x-5与5-x互为相反数，
则x=5，
故y=4；
所以|x-y|=1；
故选A．
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设x、y为实数，且y=4+
|
根据题意，y=4+
+5-x
有意义，x-5
而x-5与5-x互为相反数，
则x=5，
故y=4；
所以|x-y|=1；
故选A．
A. great
B. well-known
C. popular
D. interesting
2. They had fun in the park yesterday.[ ]
A. had much time
B. were exciting
C. had a good time
D. looked for
3. I can take care of my little sister.[ ]
A. look for
B. look after
C. look at
D. look up
4. There is lots of water in the bowl.[ ]
A. some
B. many
C. much
D. a little
5.Mother often does the laundry on Sunday.[ ]
A. does the cleaning
B. washes clothes
C. goes shopping
D. does some reading