甲公司与乙公司签订合同，向乙公司销售E、F两种产品，不含增值税的合同总价款为3万元。E、F产品不含增值税的单独售价分别为2.2万元和1.1万元。该合同包含两项可明确区分的履约义务。不考虑其他因素，按照交易价格分摊原则，E产品应分摊的交易价格为（）万元。

若允许表达式中多种括号混合嵌套，则检查表达式中括号是否正确配对的算法通常选用的辅助结构是（）

患者，女，46岁，主诉排便时阴道脱出一块物，检查见用力时阴道前壁膨出，宫颈延长，宫颈外口露于阴道口外，宫体仍在阴道内，后倾屈，附件未扪及。本例应诊断为

外感热病极期，常见的舌象是（ ）

下列配伍中，属于"十九畏"的是(   )

红色、橙色、黄色往往使人产生暖的感觉，绿色、青色、蓝色往往使人产生冷的感觉。这种现象是(  )

急性淋巴结炎属中医学

确立西方教育心理学名称和体系的第一部专著是()

中国共产党对资本主义工商业进行社会主义改造的主要方式是（   ）。

《巴尔扎克像》摒弃了一切细枝末节，这位大文豪的手和脚都被掩盖在长袍之中，使观众的注意力集中到头部，尤其是那双炯炯有神、气宇不凡的眼睛，突出了这位伟大的批判现实主义作家与众不同的气质。这座雕像成功的原因主要在于（）。

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.

One problem with the PreCheck program is_________