It would be ineffective to attempt to prevent lead poisoning by ____.
A. phasing out waste incineration
B. banning the use of lead pencils in schools
C. banning lead glazing on ceramic ware used to serve food
D. banning the use of lead solder
E. phasing out leaded gasoline worldwide
Answer: B
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In what sense do we say we are looking back in time when we are looking at the stars?
A) We see stars as they once were when their light reaches us. B) Because space curves, we are actually looking at the past when we look in the night sky. C) Because stars are emitting immense radiation, we are seeing processes that have already happened. D) Because Earth's atmosphere bends and distorts their light.
Circulation in the sea occurs in what levels?
a. Surface currents b. Middle currents c. Deep currents d. All of the above e. Both a and c
The demand for seafood, although high, has not changed much since 1980
a. True b. False Indicate whether the statement is true or false
All of the following are useful for increasing soil fertility except
A. addition of manure. B. addition of fertilizer. C. crop rotation. D. addition of iron oxide.