昆明一中2021届高三第二次月考数学答案及试题
clean the air in your home.___40___the department of energy requires that ii can remove 99.97 percent of pollutants and particles in the air. portable high-efficiency particulate air filters(过滤器)call clean a single room or the entire house.
a. work near a window.
b. study in the artificial light.
c. studies have shown that color can influence your mood.
d. maybe you have realized the importance of a healthy home.
e. leave a pair of shoes you wear in the house by the front door.
f. a high-efficiency particulate air(hepa)filter can cost much·
g. the gold standard is a high-efficiency particulate air(hepa)filter.
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