▶ Your Answer :
By increasing the number of cane toads introduced
in Australia to control pest, scientists try to remove the
creature. The reading passage’s suggests possible ways to eliminate the cane toads. On the other hand, the lecturer contradicts the methods because
these would do not work.
First, the lecturer argues that building
fence cannot control the problem of soaring cane toads. The barriers only deter organisms from crossing the land. But, the
toads move to other areas following the stream of water. Therefore,
the fences would not block their migration. This casts doubt
on the reading passage’s claim that constructing the fences is one of the effective
solutions reducing the number of the toads.
Second, the lecturer insists that it is not
good idea for volunteers to catch the cane toads. Even if they are trained, it is difficult for volunteers to differentiate
the toads from native frogs because their similarity of appearance. If they unconsciously kill off other
species, it would result in environmental disaster. This rebuffs the reading
passage’s assertion that catching the toads by volunteers lead to the decrease
in the cane toads.
Finally, the lecturer maintains that using
a new kind of virus to remove the cane toads would be detrimental. Although the
virus can remove the toads, harmful content have a negative impact on
the whole ecology by hindering their reproduction. Hence, it will destroy other creatures as well as the toads.
This refutes the reading passage’s point that by inventing a new kind of virus,
the cane toad can be eliminated.
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