购买力风险属于系统性风险，对所有证券都具有相同的影响，而且无法通过投资组合进行回避。

The teacher stood before his class and was going to hand out the final exam papers. “I know how   1   you have all worked to prepare for this test,” he said. “And because I know you can do it well, I am willing to offer a B to anyone who would   2   not to take the test. ”

Many students jumped up to   3   the teacher and left the classroom.  The teacher looked at the   4   students and said, “Does anyone else want to get a B? This is your last   5   . ” Two more students decided to go.     Seven students remained.  The teacher then handed out the   6   .  There were only three sentences typed on the paper: Congratulations! You have just   7   an A in this class.  Keep believing in yourself.     I never had a teacher like that, but I think it is a test   8   any teacher could and should give.  Students who are not   9   in what they have learned are B students at best(充其量). The same is   10   in real life.  The A students are those who believe in what they are doing because they have   11   both successes and failures.  They have learned life’s lessons, either from normal education   12   from events in their lives, and have become   13   people.      Scientists say that by the age of eight, 80% of what we believe about ourselves has already been formed.  You are a big kid now, and you   14   that  you have some limits (限制).  However, there is   15   you can’t do or learn or be.  Sir Edmund Hillary, the first person to reach the summit of Mount Everest said, “It’s not the mountain we conquer(克服) but ourselves. ”

小题1:A.  luckily        B.  terribly        C.  hard

小题2:A.  dislike        B.  help            C.  prefer

小题3:A.  thank         B.  praise          C.  fight

小题4:A.  following     B.  relaxing      C.  remaining

小题5:A.  chance        B.  trouble         C.  test

小题6:A.  results        B.  presents        C.  papers

小题7:A.  given         B.  sent            C.  received

小题8:A.  where         B.  that            C.  what

小题9:A.  confident     B.  necessary       C.  mysterious

小题10:A.  unusual        B.  impossible      C.  true

小题11:A.  broken off     B.  dreamed of      C.  learned from

小题12:A.  and           B.  or            C.  but

小题13:A.  ruder         B.  cuter           C.  better

小题14:A.  decide        B.  forget          C.  realize

小题15:A.  something     B. anything        C.  nothing

下列物质的用途与其化学性质无关的是

A．用小苏打治疗胃酸过多症

B．氧气用于气焊

C．用食醋除去热水瓶中的水垢

D．活性炭用来吸附异味

世界公认的中国最早的文字是（）。

护栏的形式按结构可分为：( )。

A．波形梁护栏

B．混凝土护栏

C．刚性护栏

D．缆索护栏

E．梁柱式钢护栏、组合式护栏

只为自己着想而全然不顾他人，是人性的原貌。