sulfur dioxide() A: 二氧化硫 B: 二氧化碳

The most significant constituents of coal are . A: hydrocarbons B: sulfur C: oxygen D: nitrogen

( ) is the highest rank of coal with highest carbon content, high heat content, low sulfur content,but limited supplies.

All organic compounds contain the element A: Phosphorus B: Nitrogen C: Sulfur D: Carbon E: Oxgen

Which group 16 element is a metal? A: tellurium B: selenium C: tellurium and polonium D: sulfur E: polonium

Which elements is not one of the three most common ones in a plant? A: Carbon B: Hydrogen C: Oxygen D: Sulfur

Which of the following English words for color have the equivalents in Chinese? A: Champagne B: Amber C: Primrose D: sulfur

The main air pollutants include : particulate matter, Ground-level ozone, Nitrogen dioxide, sulfur dioxide, carbon monoxide and lead.

____ is a typical photolithoautotroph. A: Sulfur oxidizing bacteria B: Iron oxidizing bacteria C: Cyanobacteria D: Purple non-sulfur bacteria

Texas and Louisiana______the nation in the production of sulfur and are also important salt-mining states. A: lead B: take C: contribute D: offer