单项选择题

Who usually looks after the children in a both motherless and fatherless family in America()

A. The children’s aunt.
B. The children’s nursery or school.
C. The children’s grandmother.
D. The children’s neighbour.

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单项选择题

Why is lead poisoning a new problem for condors()

A. Hunters shoot condors.
B. Puppet rearing practices have caused it.
C. Hunter’s bullets contain lead which poisons the meat condors eat.
D. They never used to like lead.

单项选择题

21()

A.fortunately
B.lastly
C.lately
D.finally