Выберите правильную букву
1. Most of healthy lakes have a … above 6.
A) water C) ph
B) depth D) surface
2. Acid … is the accumulation of acid-forming particles.
A) rain C) sleet
B) wind D) deposition
3. Lakes with a ph of 4.5 are considered to be …
A) dirty C) sterile
B) clean D) dead
4. I’m afraid you have the wrong …. It’s 110-11-12.
A) phone C) advice
B) information D) number
5. Mr. Russell is not … now. He is on business trip.
A) here C) out for
B) available D) speaking