【单选题】
Directions: There are 20 blanks in the following passage. For each blank there are four choices markedA、,B、,C、andD、on the "right side of the paper. You should choose the ONE、that best fits into the passage. Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre.
There are many sources of indoor air pollution in any {{U}} (70) {{/U}}. These include combustion (燃烧) sources, products for home cleaning and {{U}} (71) {{/U}}, personal care, or hobbies; central heating and cooling systems and humidification {{U}} (72) {{/U}}; and outdoor air pollution.
{{U}} (73) {{/U}} effects may show up after a single exposure or {{U}} (74) {{/U}} exposures. These include irritation of the eyes, nose, and throat, headaches, dizziness, and {{U}} (75) {{/U}}. Such effects are usually short-term and {{U}} (76) {{/U}}. Sometimes the treatment is simply {{U}} (77) {{/U}} the person’s exposure to the source of the pollution, {{U}} (78) {{/U}} it can be identifieD、{{U}} (79) {{/U}} of some diseases may also show up soon after exposure to some indoor air pollutants.
Certain effects are similar to those from colds or other viral (病毒引起的) diseases, {{U}} (80) {{/U}} it is often difficult to {{U}} (81) {{/U}} if the symptoms are a result of exposure to indoor air pollution. {{U}} (82) {{/U}} this reason, it is important to pay attention to the time and place the symptoms {{U}} (83) {{/U}}. If the symptoms fade or go away when a person is away from home and return when the person returns, {{U}} (84) {{/U}} should be made to identify indoor air sources that may be possible {{U}} (85) {{/U}}. Some effects may be made worse by an {{U}} (86) {{/U}} supply of outdoor air or from the heating, cooling, or humidity conditions prevalent in the home.
B．transmit
C．survive
D．occur
网考网参考答案：D
网考网解析：
[解析] 根据the time and place选occur，表示症状“出现、发生”的时间、地点。其他选项的意思分别为：exist“存在”，transmit“传播，传染”，survive“幸存，活下来”。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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