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珍爱生命，增进健康是当今人们普遍关注的话题，是民族兴旺，社会发展的重要保障。试结合下列具体实倒，回答有关问题： （1）自2009年3月份安徽出现首例手足口病至今，全国手足口病患者已累计数万人。手足口病是由肠道病毒引起的传染病，主要经粪便——口或呼吸道——飞沫传播。为了防止手足口病的继续蔓延，专家建议：“要尽量避免接触患者及其分泌物”，这属于预防传染病措施中的________________；“对于发现的病例或感染者要严格隔离治疗”，这属于预防传染病措施中的________________。 （2）自青海玉树地震以来，卫生部投入大量人力、物力，对灾区儿童进行了甲肝、乙脑等疫苗的强化接种，使其在不发病的情况下产生_________。强化儿童对相应传染病的________，确保大灾之后无大疫。 （3）近年来，我国感染艾滋病的人数不断增多，由于其危害大，难治疗，以致于人们“色变”。其实，只要在日常生活中养成文明健康的生活方式和良好的________习惯，阻断传播途径。就会有效的预防艾滋病。
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【简答题】网球场地大致可以分为硬地、 、红土,共三种。
【简答题】a. 随意 , 未经事先考虑的
【多选题】Explain the three main classes of c ell-surface receptors.
A.
All cell-surface receptor proteins bind to an extracellular signal molecule and transduce its message into one or more intracellular signaling molecules that alter the cell’s behavior. Most of these receptors belong to one of three large classes, which differ in the transduction mechanism they use.
B.
1. Ion-channel-coupled receptors change the permeability of the plasma membrane to selected ions, thereby altering the membrane potential and, if the conditions are right, producing an electrical current.
C.
2. G-protein-coupled receptors activate membrane-bound, trimeric GTP-binding proteins (G proteins), which then activate (or inhibit) an enzyme or an ion channel in the plasma membrane, initiating an intracellular signaling cascade.
D.
3. Enzyme-coupled receptors either act as enzymes or associate with enzymes inside the cell; when stimulated, the enzymes can activate a wide variety of intracellular signaling pathways. Many enzyme-coupled receptors have their own enzyme activity, while others rely on an enzyme that becomes associated with the activated receptor.