What does the underlined word "matriarch" mean？
An old member of an elephant family.
B. A female head of an elephant family.
C. A wise elephant.
D. A large elephant.
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When do elephants form. into a group？
A. When they are feeding the young.
B. When they see a familiar elephant.
C. When they are giving birth to baby elephants.
D. When the leading elephant gives out a warning.
【B15】
A. perfect
B. successful
C. badly
D. well
You don't need to introduce her. I ______ her several times this year.
A. had met
B. have met
C. met
D. meet
The experiment is well worth ______ again.
A. trying
B. being tried
C. to try
D. to be tried
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