单项选择题
1、 It has been proved __ _ eating vegetables in childhood helps to protect you against serious illnesses in later life。
A．if
B．because
C．when
D．that


2、— Happy birthday!
— Thank you! It’s the best present I for.
A．should have wished
B．must have wished
C．may have wished
D．could have wished


3、 若f(x+1)=1/2f(x)，则函数f(x)可以是    (  )
A．
B．
C．
D．


4、 近年来，中国人口老龄化的进程明显加快，其主要原因是（　　）
A．经济迅速发展和城市化水平高
B．人口自然增长率下降和生活水平提高
C．平均寿命延长和人口自然增长率上升
D．环境质量改善和人口素质提高


5、通读下面的短文，回答题。
     When did you last see a polar bear? On a trip to a zoo, perhaps? If you had attended a winteractivity in New York a few years ago, you would have seen a whole polar bear club． These" PolarBears" are people who meet frequently in winter to swim in freezing cold water． That day, the airtemperature was 3oC, and the water temperature was a bit higher． The members of the Polar BearClub at Coney Island, New York are usually about the age of 60． Members must satisfy two require-．~
     ments． First, they must get along well with everyone else in the group． This is very important becausethere are so many different kinds of people in the club． Polar Bears must also agree to swim outdoorsat least twice a month from November through February．
      Doctors do not agree about the medical effects of cold-water swimming． Some are worried aboutthe dangers of a condition in which the body' s temperature drops so low that finally the theart stops．Other doctors, however, point out that there is more danger of a heart attack during summer swimmingbecause the difference between the air temperature and water temperature is much greater in surmner thanin winter．
     The Polar Bears themselves are satisfied with the benefits (or advantages)of cold-water swim-ming． They say that their favorite form of exercise is very good for the circulatory system(循环系统)because it forces the blood to move fast to keep the body warm． Cold-water swimmers usually turnbright red after a few minutes in the water． A person who turns blue probably has a very poor circula-tory system and should not try cold-water swimming．
      The main benefits ( or advantages) of cold-water swimming are probably mental． The Polar Bearslove to swim year-round; they find it fun and relaxing． As one 70-year-old woman says," When I gointo the water, I pour my troubles into the ocean and let them float away． "
Doctors__________．
A．encourage people to take part in cold-water swimming actively
B．point out the possible danger of blood illness during cold-water swimming
C．believe swimming is helpful both in winter and in summer
D．have different ideas about the medical effects of cold-water swimming


6、 You forget__________ it to me． I haven't forgotten__________ it to you yesterday．
A．to return; to give
B．returning; giving
C．to return; giving
D．returning; to give


7、下列各句中加点的成语使用不正确的一项是（　　）
A．新设备十分复杂，了解其结构原理有助于在维修保养中有的放矢，避免盲目。
B．这家刚开业的公司的业绩连续十个月保持增长，真可谓江河日下、一日千里。
C．一些食品加工小作坊不顾有关食品安全法的规定，仍然我行我素，违规生产。
D．主管部门应该一视同仁，让民营剧团享受到国有剧团的政策补贴和优惠待遇。


8、抛物线x²=4y上一点A的纵坐标为4，则点A与抛物线焦点的距离为
A．2
B．3
C．4
D．5


9、 工业上制造金刚砂(SiC)的化学方程式为

在此反应中还原剂和氧化剂的物质的量之比为（　　）
A．1：2
B．2：1
C．1：3
D．3：1


填空题
10、 2，4-二甲基-4，5-二乙基庚烷的结构简式为______．

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