以下计算某厂50～55岁工人肝癌标准化比例死亡比(SPMR)分组期望值的方法哪一项是

阅读理解。

     It's an amazing change when a caterpillar (毛毛虫) turns into a butterfly. That just might explain Taiwan

singer Jolin Tsai's choice of name for her latest album (唱片／专辑).

     On March 27, Tsai will release Flower Butterfly, her first album for Warner, the company she signed to

recently.

     The 28-year-old Tsai is known for the challenges she takes on. This time it is ballet. For the video that

goes with the album, she had to pirouette (用脚尖旋转) 20 times without stopping. It was hard going. When

she started training she couldn't even manage to spin (旋转) three times.

     "It took me longer to learn the move than anything I've ever tried!"she said.

     If the ballet was hard, the photo for the album art may have been harder. Tsai had to hang upside down

from a wire for an hour. It was so that her shadow (影子) would seem like a butterfly spreading its wings.

     But Tsai is facing another challenge. Her old record company (唱片公司), EMI will release an album of

music Tsai recorded when she was with the label. This means that Flower Butterfly will be fighting it out in

the market with old Jolin music.

     But Tsai didn't seem to care about the problems with her old company:

      "I've trained myself to be strong. I hope that other girls will follow my example and be themselves. Don't

be afraid of what other people say. One day you'll turn into a beautiful butterfly."

1. Taiwan singer Jolin Tsai is famous for ______.

A. her latest album

B. the challenges she takes on

C. Flower Butterfly

D. an amazing change

2. From this passage, we can know ______.

A. Tsai was good at ballet when she was young

B. it took her a short time to learn the move

C. when she started training she couldn't even manage to spin three times

D. Tsai seemed to care about the problems with her old company

3. Tsai hopes that ______.

A. one day she'll turn into a beautiful butterfly

B. her shadow would seem like a butterfly spreading its wings

C. other girls will follow her example and be themselves

D. Flower Butterfly will be fighting it out in the market with old Jolin music

下图的两位历史人物体现了唐朝与哪一少数民族间的友好关系       

A．吐蕃

B．回纥

C．南诏

D．突厥 

标准贷记卡普卡的年费可以用（）积分来换。

A.1000

B.2000

C.3000

D.4000

不符合需求价格弹性和需求价格弹性系数要点的是( )。

A．需求价格弹性是指价格变动所引起的需求量变动的程度，即需求量变动对价格变动的反应程度
B．价格是因变量，需求量是自变量
C．需求价格弹性系数是需求量变动率与价格变动率的比值，而不是需求量变动绝对量与价格变动绝对量的比值
D．需求价格弹性系数的数值可以是正值，也可以是负值，这取决于有关两个变量的变动方向

光学合像水平仪的合像是通过（）原理进行的。

A、光学

B、重力

C、机械

D、齿轮传动