blue:2022
Green:2021
4/9
CFL bulbs and incandescent lamps
Reading:
1. CFL is expensive and the cost is high
2. Mercury in CFL will pollute the environment
3. The color of the CFL is uncomfortable for the eyes
Listening refutations:
1.CFL is more durable and can save more money
2. Although CFLs emit mercury, incandescent lamps have more mercury
3. The latest CFL solves this problem and is able to provide different colors
4/3
Topic: Challenges in building the Erie Canal
Reading:
1. The local terrain and landscape cause construction difficulties;
2. Insufficient labor force;
3. The benefits of the canal are not enough to make up for the high costs.
Listening:
1. Assisted by animal power, work in winter
,2. Immigrants from Europe can provide sufficient workers;
3. The canal can save huge transportation costs, which is greater than the construction cost.
4/3
Methods of Controlling Overgrowth of Gamba Grass
Reading:
1. Use chemical herbicides.
2. Restoration, introducing native plants to limit its living space.
3. Introduce large herbivores to eat.
Listening refutations:
1. Herbicides can only be effective in moderate areas and areas with suitable temperature, but
the weather in Australia is very hot, and this plant does not absorb herbicides.
2. The fencing method only works temporarily for one season, because this grass grows faster
than native plants, so it can spread quickly.
3. Introducing elephants is also not feasible and will create bigger problems.
3/16
Before Columbus discovered America, someone sailed across the Atlantic and discovered
America
Reading:
1. Tobacco is native to the Americas, not Egypt, but nicotine has been detected in this human
hair by then
2. The coins minted by this man seem to have a map of America on them
3. Native American totems have many similarities with pyramids.
, Listening refutations:
1. Nicotine was discovered in Egypt long before the Americas, probably produced by other
plants in Egypt rather than tobacco
2. The so-called map has only a small trace, and is probably not a map at all
3. Actually the pyramids in America are very different from the pyramids in Egypt
3/12
A wetland plant with parts of its roots exposed to the ground, called knees, discusses its role
Reading:
1. Absorb oxygen;
2. Keep the tree stable so that the tree is not damaged by wind or water;
3. Expel methane
Listening refutations:
1. Scientists did experiments and found that the oxygen content did not change, and it was not
used to absorb oxygen;
2. The roots used to maintain the stable support of the tree are vertical roots, while knees grow
on horizontal roots and do not have the function of maintaining stability;
3. Methane is not harmful to plants. There are many microorganisms on the roots of trees that
can also emit methane, and they do not need to be discharged by knees.
2/20
Reading: Three reasons why wild tigers are gradually disappearing
1. Poaching to make money
2. Conflict of interest between local residents and tigers