当某期货合约以涨跌停板价格成交时，一律采用成交撮合实行平仓优先和时间优先的原则。（  ）

执行价格为450美分／蒲式耳的玉米看涨和看跌期权，当标的玉米期货价格为400美分／蒲式耳时，看涨期权和看跌期权的内涵价值分别为(    )美分／蒲式耳。

目前绝大多数国家采用的外汇标价方法是( )。

《基础教育课程改革纲要》指出，学校应大力开展“阳光体育”运动，保证小学生每天的锻炼不少于( 　)。

下图所示的碾压式土石坝，是（  ）。

Passage 1    It's one of our common beliefs that mice are afraid of cats. Scientists have long known that even if a mouse has never seen a cat before, it is still able to detect chemical signals released from it and run away in fear. This has always been thought to be something that is into a mouse's brain.    But now Wendy Ingram, a graduate student at the University of California, Berkeley, has challenged this common sense. She has found a way to "cure" mice of their inborn fear of cats by infecting them with a parasite, reported the science journal Nature.    The parasite, called Toxoplasma gondii, might sound unfamiliar to you, but the shocking fact is that up to one-third of people around the world are infected by it. This parasite can cause different diseases among humans, especially pregnant women-it is linked to blindness and the death of unborn babies.    However, the parasite's effects on mice are unique. Ingram and her team measured how mice reacted to a cat's urine (尿) before and after it was infected by the parasite. They noted that normal mice stayed far away from the urine while mice that were infected with the parasite walked freely around the test area.    But that's not all. The parasite was found to be more powerful than originally thought-even after researchers cured the mice of the infection. They no longer reacted with fear to a cat's smell, which could indicate that the infection has caused a permanent change in mice's brains.    Why does a parasite change a mouse's brain instead of making it sick like it does to humans? The answer lies in evolution. "It's exciting scary to know how a parasite can manipulate a mouse's brain this way," Ingram said. But she also finds it inspiring. "Typically if you have a bacterial infection, you go to a doctor and take antibiotics and the infection is cleared and you expect all the symptoms to also go away." She said, but this study has proven that wrong. "This may have huge implications for infectious disease medicine."
The passage is mainly about ______.

患者，女，60岁，现病史：近日因摔倒而致左腕骨骨折。骨科处理；因背痛加重接受口服止痛治疗。骨密度L1～L4椎体T值-2.7SD，BMD749( mg/cm²)；股骨颈T值-2.2SD，BMD602 (mg/cm²)。医生诊断为：绝经后骨质疏松症。诱发骨质疏松症的原因不包括（）

某混凝土坝工程为改善岩基的力学性能，减少基础的变形和不均匀沉陷，改善工作条件，减少基础开挖深度而采用的水泥灌浆属于(    )。

患者，男，50 岁。因肺炎住院，患者前往放射科摄 X 线片。其病床应铺成（  ）

主治心悸失眠，自汗盗汗的药物是(     )

常伤及人体上部、阳经和肌表，使皮毛腠理疏松的外感病邪是（   ）。