场内交易市场的组织方式是做市商制度。（）
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A．Na2SO4
B．(NH4)2SO4
C．Pb(Ac)2
D．HNO3(△)
When a disease of epidemic proportions threatens the public, scientists immediately get to work, trying to locate the source of affliction and find ways to combat. Vaccination is one of the effective ways to protect the (1) population of a region or country which may be (2) grave risk. The process of vaccination allows the patient’s body to (3) immunity to the virus or disease so that, if it is encountered, one can fight it (4) naturally. To accomplish this, a small weak or dead (5) of the disease is actually injected into the patient in a controlled environment, (6) his body’s immune system can learn to fight the invader (7) . Information (8) how to penetrate the disease’s defenses is (9) to all elements of the patient’s immune system in a process that occurs naturally, in which genetic information is passed from cell to cell. This makes sure that (10) the patient later come into contact with the real problem, his body is well equipped and trained to (11) with it, having already done so before.
There are, however, dangers (12) in the process. (13) , even the weakened version of the disease contained in the vaccine proves (14) much for the body to handle, resulting in the immune system (15) , and, therefore, the patient’s death. Such is the case of the smallpox vaccine, (16) to eradicate the smallpox epidemic that nearly (17) the whole Native American population and killed massive numbers of settlers. (18) 1 in 10,000 people who receive the vaccine (19) the smallpox disease from the vaccine itself and dies from it. Consequently, the process, which is truly a (20) , may indeed hide some hidden curses.
17（）
A.wiped out
B.ruled out
C.break down
D.died out
在过去两个世纪内，人类排放的二氧化碳40%被海洋所吸收，大海减缓了全球变暖的步伐，但是将付出高昂的代价：与工业化前水平相比，二氧化碳导致海洋的平均PH值降低了大约0.1个单位。视现在二氧化碳的排放速度，到21世纪中叶，海洋的平均PH值下降可以高达0.35个单位。海洋酸化给海洋生物带来了严重损害，实验表明，PH值降低0.2—O.3个单位，将干扰海洋生物中最重要的基础生物珊瑚虫以及其它浮游生物的骨骼钙化。为了保护海洋生物，需将PH值下降范围控制在0.2以内，这是1976年美国国家环境保护局发布的极限值。这段文字意在说明( )。
A．二氧化碳大量排放引发海洋酸化，海洋生物面临生存危机
B．海洋酸化危害海洋生物生存，二氧化碳减排迫在眉睫
C．海洋酸化将引发新一轮的环境危机，须警惕其对海洋生物的危害
D．对海洋酸化的趋势应引起重视，务必将PH值控制在极限值以内
经腹超声扫查，妊娠几周可显示妊娠囊
A．2～3周
B．5～6周
C．9～10周
D．7～8周
E．10周以上
结构化金融产品通常会内嵌一个或一个以上的衍生产品，它们都是以合约规定条款 (如提前终止条款)形式出现的。( )