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【单选题】
What can a dog do for his master now?A.
It can go hunting with the master.
B.
It can protect the master from animals.
C.
It can protect the master from thieves.
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举一反三
【简答题】用力摁住伤口
【简答题】According to mechanism the polymerization can be classified into ______ and ______.
【单选题】下列关于人体内有氧呼吸和无氧呼吸的比较，正确的是 [ ]
A.
二氧化碳只是有氧呼吸的产物
B.
葡萄糖只能作为有氧呼吸分解的底物
C.
还原氢只在有氧呼吸过程中产生
D.
无氧呼吸的两个阶段都能释放能量
【单选题】In the United States, someone is classified as unemployed if he or she
A.
does not have a job.
B.
does not have a job, or else has a job but is looking for a different one while continuing to work.
C.
does not have a job, has recently looked for work, and is collecting unemployment insurance.
D.
does not have a job, and is collecting unemployment insurance.
E.
none of the above
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