承包商应于( )前，将其任命的承包商代表的姓名以及详细资料提交工程师，以取得工程师

杂合子的准确含义是[ ]

A．不同种生物杂交产生的后代

B．个体杂交产生的后代

C．由含相同遗传因子的配子结合成的合子发育成的个体

D．由含不同遗传因子的配子结合成的合子发育成的个体

It was one of those terribly hot days in Baltimore. Needless to say, it was too hot to do anything outside. But it was also scorching in our apartment. This was 1962, and I would not live in a place with an air conditioner for another ten years. So my brother and I decided to leave the apartment to find someplace indoors. He suggested we could see a movie. It was a brilliant plan.

Movie theaters were one of the few places you could sit all day and—most important —sit in air conditioning. In those days, you could buy one ticket and sit through two movies. Then, the theater would show the same two movies again. If you wanted to, you could sit through them twice. Most people did not do that, but the manager at our theater. Mr. Bellow did not mind if you did.

That particular day, my brother and I sat through both movies twice, trying to escape the heat. We bought three bags of popcorn and three sodas each. Then, we sat and watched The Music Man followed by The Man Who Shot Liberty Valance. We’d already seen the second movie once before. It had been at the theater since January, because Mr. Bellow loved anything with John Wayne in it.

We left the theater around 8, just before the evening shows began. But we returned the next day and saw the same two movies again, twice more. And we did it the next day too. Finally, on the fourth day, the heat wave broke.

Still, to this day I can sing half the songs in The Music Man and recite half of John Wayne and Jimmy Stewart’s dialogue from The Man Who Shot Liberty Valance! Those memories are some of the few I have of the heat wave of 1962. They’re really memories of the screen, not memories of my life.

小题1:In which year did the author first live in a place with an air conditioner?

A．1952

B．1962

C．1972

D．1982小题2:What does the underlined word”It” in Paragraph 3 refer to?

A．The heat

B．The theater.

C．The Music Man

D．The Man Who Shot Liberty Valance小题3:What do we know about Mr. Bellow? 

A．He loved children very much.

B．He was a fan of John Wayne.

C．He sold air conditioners.

D．He was a movie star.小题4:Why did the author and his/her brother see the same movies several times?

A．The two movies were really wonderful.

B．They wanted to avoid the heat outside.

C．The manager of the theater was friendly.

D．They liked the popcorn and the soda at the theater.小题5:What can we learn from the last paragraph?

A．The author turned out to be a great singer.

B．The author enjoyed the heat wave of 1962.

C．The author’s life has been changed by the two movies.

D．The author considers the experience at the theater unforgettable.

γ铁在925℃渗碳，碳原子的跃迁频率Γ=1.7×10⁹s^-1，而在1025℃时碳原子的跃迁频率F=5×10⁹s^-1。若碳原子的跃迁步长为2.53×10^-10m，求扩散常数D₀和扩散激活能Q(假定D₀与Q均与温度无关)。

甘特图是用来安排项目计划的重要工具，有关甘特图的优点，以下说法错误的是（）

A.简明、形象、直观

B.可以方便地确定关键活动

C.可以在任何时点上分析项目正在进行的活动和所需资源

D.可以方便地检查项目进度

西尔伯的约束诱致假说认为，金融创新就是为了( )。

A．规避管制

B．寻求利润的最大化

C．制度变革

D．降低交易成本