单项选择题

Biologists report that the biodiversity is decreasing because ______.

A．more individual households are increasing greatly
B．human beings are threatening many wild creatures
C．human populations have been decreasing in recent years
D．wild creatures depend on more individual households

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单项选择题The passage mainly tells us that ______.

A．the increase of human population leads to more destruction of the natural world
B．the decrease of animal population results from the dwindling biodiversity in the natural world
C．the planet's biodiversity is also related to the number of households
D．the planet's biodiversity relies on the balanced increase of larger and smaller households