Passage A: Algae may help the growth of bacteria. B: It can be contaminated by chlorine. C: Animals may drink it. D: It can be contaminated by rain.

The removal of （） from lubricating oil will reduce engine wear and possible breakdowns. A: contaminating water B: contaminated additives C: contaminated fuel D: contaminating impuritie

Cargo contaminated due to failure to provide clean holds prior to loading is an example of ____.

Graig Haynes was contaminated with mercury, thus he could give off a strange blue light.

Transmission can occur except when: ( ) A: blood is exchanged by contaminated transfusion or needle sharing, e.g., hepatitis C B: exchange of saliva by mouth, e.g., Epstein-Barr virus; C: contaminated food or water is digested D: body fluids are exchanged during sexual activity, e.g., HIV

4. contaminate, contaminated, contamination a. This river is badly by life wastes. b. Soil occurs wherever there is a chemical factory.

The big lake was contaminated with waste waters from nearby factories. A: widened B: blackened C: polluted D: mixed

Prions are considered “_________” because they can also spread from an affected individual to a normal individual via contaminated food, blood, or surgical instruments.

Which of the following operation is wrong? A: Waste contaminated with chemicals and fragile glass instruments should be classified and recycled with household garbage.‍ B: Harmless treatment should be done for the special, high-risk and highly toxic chemical waste. C: Rags contaminated with chemicals can still be put in household trash bin. D: Do not mix two liquids arbitrarily to avoid danger.

It’s one thing to learn the rules of politics from books. It is quite another to get into the _______ world of real-life politics. A: contaminated B: confusing C: complicated D: complex