▶ Your Answer :
In the lecture, the speaker contends that
the three methods in reading passage are groundless, which contradicts the
reading passage's assertion that there are several ways to solve the emerald
ash borers' problem.
To begin with, the speaker maintains that
removing trees is not effective way. This is because it takes at least one to
two years to check the affected trees. Also, unlike urban area, it doesn't work
in the forest because there are too many trees to check one by one. This is in
contradictory to the reading passage's claim that it is the easiest way to
simply remove the affected trees.
The second argument the lecturer makes is
that a chemical treatment is not that good idea to deal with the emerald ash
borers. He points out that insecticides often cause ground water pollution. This
view is in direct opposition to the reading's opinion that using insecticides
is a good to deal with these beetles.
Lastly, the lecturer asserts that releasing
parasitic wasps is not effective way. This is because the length of their life
time is dependent on the region. They will die when they are in cold area. And, they might kill other types of insects,
so they are likely to ruin eco-system in North America.
This refutes the reading passage's
insistence that biological pest control can be a solution.
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