慢性肺源性心脏病发病的主要因素，下列哪项不正确（    ）

请阅读  Passage 1,完成第  21~25小题 。

Passage 1

First two hours, now three hours-this ishow far in advance authorities are recommending people show up to catch adomestic flight, at least at some major U.S. airports with increasingly massivesecurity lines.

Americans are willing to toleratetime-consuming security procedures in return for increased safety. The crash ofEgyptAir Flight 804, which terrorists may have downed over the Mediterranean Sea,provides another tragic reminder of why. But demanding too much of airtravelers or providing too little security in return undermines public supportfor the process. And it should: Wasted time is a drag on Americans ' economicand private lives, not to mention infuriating.

Last year, the Transportation SecurityAdministration (TSA) found in a secret check that undercover investigators wereable to sneak weapons-both fake and real-past airport security nearly everytime they tried. Enhanced security measures since then, combined with a rise inairline travel due to the improving economy and low oil prices, have resultedin long waits at major airports such as Chicago ' s O ' Hare International. Itis not yet clear how much more effective airline security has become-but thelines are obvious.

Part of the issue is that the governmentdid not anticipate the steep increase in airline travel, so the TSA is nowrushing to get new screeners on the line. Part of the issue is that airportshave only so much room for screening lanes. Another factor may be that morepeople are trying to overpack their carry-on bags to avoid checked-baggagefees, though the airlines strongly dispute this.

There is one step the TSA could take thatwould not require remodeling airports or rushing to hire: Enroll more people inthe PreCheck program. PreCheck is supposed to be a win-win for travelers andthe TSA. Passengers who pass a background check are eligible to use expectedscreening lanes. This allows the TSA to focus. on travelers who are higherrisk, saving time for everyone involved. The TSA wants to enroll 25 millionpeople in PreCheck.

Ithas not gotten anywhere close to that, and one big reason is sticker shock:Passengers must pay $85 every five years to process their background checks.Since the beginning, this price tag has been PreCheck ' s fatal flaw. Upcomingreforms might bring the price to a more reasonable level. But Congress shouldlook into doing so directly, by helping to finance PreCheck enrollment or tocut costs in other ways.

The crash of EgyptAir Flight 804 is mentioned to_____.  .

诊断代谢性酸中毒的主要依据是(   )

欣弗，又称克林霉素磷酸酯葡萄糖注射液，是一种无色的澄明液体。在临床上多被用来治疗革兰阳性菌引起的感染病，如扁桃体炎、急性尿道炎等。2006年8月，全国各省市级医院陆续传出有患者因注射安徽华源生物药业生产的欣弗注射液后，出现不良反应，甚至造成数人死亡。卫生部发布紧急通知，要求召回该药厂6月后生产的所有欣弗注射液。调查发现，该药厂在制备注射液时，为了降低成本，违规将灭菌的温度降低、时间大大缩短，就是这小小的改动造成了轰动全国的惨案，毁灭了多少幸福的家庭。下列药物及其对映异构体具有相同药理活性的是

通常用“不要将所有的鸡蛋放在一个篮子里”来形象说明（  ）。

溢出性蛋白尿可见于（   ）

神经-骨骼肌接头处的化学递质是

施工过程质量验收主要是指检验批和分项、分部工程的质量验收，关于施工过程质量验收的内容，以下说法正确的是（   ）。

和解协议具有合同的效力，对双方有强制执行效力，如果一方当事人违反，则应当承担违约的民事责任。（  ）

下列引起攻击性行为的原因，表述错误的是(    )。