单项选择题

Why are the lions in the Gir Forest especially vulnerable to disease

A．They are physically weaker than the African lions.
B．They are small in size.
C．They do not have enough to eat.
D．They have descended from a dozen or so ancestors.

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单项选择题

Which of the following is NOT among the reasons that India is creating a secondary sanctuary for the Asiatic lions

A．Too many of them in the present sanctuary.
B．Possible outbreak of disease.
C．Clashing with people.
D．Food shortag

单项选择题

As can be gathered from the passage, before 1910 the normal running time of a film was probably ______.

A．15 minutes or less
B．between 15 and 30 minutes
C．between 30 and 45 minutes
D．1 hour or more