8.What did the author learn from her mother?
A.It's never too late to write.
B.Action speaks louder than words.
C.One good turn deserves another.
$来&源:D.Two heads are better than one.
C
(2016·石家庄市高中毕业班模拟考试)
For visitors, Teller Lake in Colorado looks like a fishbowl filled with thousands of gorgeous goldfish. However, to the Colorado Parks and Wildlife Department they are a group of dangerous species that could end up destroying the lake's ecosystem.
The problem is that these fish aren't native to the lake, which means they have no predators (捕食者). This allows them to multiply in large numbers. Park officials believe that most of them are a result of a few unwanted pet goldfish that were thrown into the lake.
While that may appear to be a kind thing to do, it is extremely dangerous, not to mention illegal. That's because as this nonnative species grow in numbers, they compete with the existing fish for food sources like small insects.Given that there is only a limited supply of resources, this could result in the goldfish overpowering the native fish species. In the case of Teller Lake, the officials are particularly worried that the goldfish will move downstream and affect the population of some of the endangered native species that live there. Another major cause for concern is the diseases the goldfish may be carrying.
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