Automobile Dealer's Advertisement：
The Highway Traffic safety Institute reports that the PZ 1000 has the west injuries per accident of any car in its class．This shows that the PZ 1000 is one of the safest cars available today．
Certain messenger molecules fight damage to the lungs from noxious air by telling the muscle cells encircling the lungs’ airways to contract．This partially seals off the lungs．An asthma attack occurs when the messenger molecules are activated unnecessarily, in response to harmless things like pollen or household dust．
Which of the following，if true，points to the most serious flaw of a plan to develop a medication that would prevent asthma attacks by blocking receipt of any messages sent by the messenger molecules referred to above?
Automobile的广告说:The Highway Traffic safety Institute 报道说 PZ 1000（应该是他们生产的车的一种） 的每一辆车在它同一档次的车中是最低的交通事故率最低的．所以PZ 1000 是目前最安全的车中的一种。
一些messenger molecules能通过肌肉细胞包围肺部的 airways 来阻挡对肺有害的有毒气体，以此来封住肺的一部分。当有一些没有害的气体比如pollen or household dust引起messenger molecules 过于活跃时哮喘就会发生。
翻译的不好 ，请见谅
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