2. 外语
  3. After inv estimating five residential gas explosions that killed four people in the Kansas City--Topeka area in 1988 and 1989, t

After inv estimating five residential gas explosions that killed four people in the Kansas City--Topeka area in 1988 and 1989, t

admin2014-03-21  51
问题      After inv estimating five residential gas explosions that killed four people in the Kansas City--Topeka area in 1988 and 1989, the National Transport action Safety Board has【C1】______ that automatic shut -off valves be required when home gas lines are installed or 【C2】______ The valves stop 【C3】 ______ and potentially【C4】______ surges in gas flow, such as would occur 【C5】______  a contractor hit and ruptured a pipe.
     The NTSB labeled the report" urgent",【C6】______ it doesn’t rate the risk
of surges high enough to ten consumers to【C7】______ $ t000 or so to dig up old lines and【C8】______ the $15 to $20 valve. A bigger【C9】______ to homeowners, says the NTSB, is the danger of slow 【C10】______ from pipe cur rosin,【C11】______ the valve would not prevent. Symptoms of a possible gas【C12】______ under your property include a sulfur smell and brown spots or dead【C13】______  in your yard. Call your gas company【C14】______ two of the Kansas City-area explosions【C15】______  had gas odors been【C16】______ And before【C17】______ start construction in your 【C18】______ , ask your gas company to【C19】______ mark the position of pipes【C20】______  your house.
【C1】
选项 A、stated
B、urged
C、thought
D、stressed
答案B
解析 根据语法结构推断，此题填B，因为urge引导的宾语从句要用虚拟语气(should)be required其他三项无此用法。
转载请注明原文地址:https://kaotiyun.com/show/2HUK777K
0

专业英语四级

相关试题推荐
随机试题
最新回复(0)