单项选择题

Why is it likely for those cloned animals born alive to have abnormalities

A．Scientists haven't got the faintest idea at all.
B．Scientists haven't researched into the cause.
C．Scientists speculate that there must be something wrong in the genetic reprogramming.
D．Scientists calculate that those animals are susceptible to diseases.
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单项选择题
What description best fits Mrs. Calloway, as the author perceived her
A．A warm-hearted person.
B．An awesome person.
C．A substitute mother.
D．A tutor.
单项选择题
Which of the following was a rule in Mrs. Calloway's library
A．Children could check out only two books at a time, but adults could take four books.
B．Children and adults could check out only four books at a time.
C．Children and adults could check out only two books at a time.
D．Children could check out books only when accompanied by an adult.
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