76. The passage begins with ____.

1. a commercial advertisement
2. a horrible warning
3. sale promotion
4. good news

77. What is the liquid CO₂ for?

1. Better cleaning clothes.
2. Helping recycle dry cleaners.
3. Dissolving the toxic waste from dry cleaning.
4. Reducing the toxic emission from dry cleaning.

78. The right detergent for CO₂ ____.

1. makes dry cleaning easy
2. must be chemically soluble
3. is chemically of two purposes
4. means a right person for dry-cleaning

79. When they are saying "get this burden off my back," the dry-cleaner owners refer to ____.

1. the competition in the business of dry cleaning
2. the pressure from EPA
3. their potential profit
4. their selling point

80. What is the strongest selling point of the MiCell technology according to Lienhart?

1. It will promote dry-cleaning business.
2. It is environment-friendly.
3. It costs less in the market.
4. All of the above.

(Reference keys.)