() 4. —Is your sister a nurse?
一Well,she . But she is a doctor now.
A. used to B. was used to
C. used to be D. is used to be
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Robot scientists are not just trying to make robots look like people. For example,there are already robots w 1 in factories. These robots look more like huge arms. They do s 2 jobs over and over again. People would not like to do such jobs and would get bored. But robots will never get bored. In the f 3 ，there will be more robots e 4 yand humans will have,1 5 work to do. New robots will have many different s 6 Some will look,like humans,and others might look like snakes. After an earthquake,a snake robot could help look for people under b 7 ' . That may not seem possible now,but computers,space r 8 and even electric toothbrushes seemed i 9 a hundred years ago. We n 10 know what will happen in the future.
1. 2. 3. 4. 5.
6. 7. 8. 9. 10.
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2. One of the opinions against smoking is that it is (有害的) to people’s health.
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() 9. the machine for keeping the house warm?
A. Do;use B. Is;using
C. Is;used D. Did;use
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