随机样本满足的条件是无限性。（）

Each spring brings a new blossom of wildflowers in the ditches along the highway I travel daily to work.

There are some particular blue flowers that have always caught my eye. I’ve noticed that they bloom only in the morning hours and the afternoon sun is too warm for them. Every day for about two weeks, I see those beautiful flowers.

This spring, I started a wildflower garden in our yard. I can look out of the kitchen window while doing the dishes and see the flowers. I’ve often thought that those lovely blue flowers from the ditch would look great in that bed alongside other wildflowers. Every day I drove past the flowers thinking, “I’ll stop on my way home and dig them.” “Gee, I don’t want to get my good clothes dirty…” Whatever the reason, I never stopped to dig them. My husband even gave me a folding shovel（铲子）one year in my car to be used for that expressed purpose.

One day on my way home from work, I was shocked to see that the highway department had destroyed the ditches and the pretty blue flowers were gone. I thought to myself, “Way to go, you waited too long. You should have done it when you first saw them blooming this spring.” A week ago we were shocked and saddened to learn that my oldest sister has a terminal brain tumor（肿瘤）. She is 20 years older than me and unfortunately, because of age and distance, we haven’t been as close as we all would have liked. I couldn’t help but see the connection between the pretty blue flowers and the relationship between my sister and us. I do believe that God has given us some time left to plant some wonderful memories that will bloom every year for us. 

And yes, if I see the blue flowers again, you can bet I’ll stop and transplant them to my wildflower garden.

小题1: Why did those flowers the writer saw only bloom in the morning?

A．Because it was hot in the afternoon.

B．Because someone picked them away.

C．Because someone took them into houses.

D．Because the writer passed them in the morning.小题2: Which of the following statements is right according to the passage?

A．The writer’s sister died of lung tumor.

B．The writer was regretful when she heard her sister’s death.

C．The writer planned to dig the flowers to give them to her husband.

D．The writer’s husband planned to plant some flowers in the garden.小题3: The writer wrote the passage to tell us ________.

A．to enjoy what we have now

B．to value now and not to lose chances

C．to protect the beautiful flowers we see

D．to love those who are your close relatives

脉冲多普勒和连续多普勒之间有何种区别？( )

A．脉冲多普勒受到脉冲重复频率的限制，对流速过高的血流无法测量

B．连续多普勒受到脉冲重复频率的限制，对流速过高的血流无法测量

C．脉冲多普勒和连续多普勒均可以定位

D．脉冲多普勒和连续多普勒均不可以定位

E．连续多普勒可以定位，而脉冲多普勒不行

患儿女，8岁，因“ * * 增大，身高增长加快， * * 分泌物增多”来诊。查体：身高132cm，体重30kg；双侧 * * 发育（TannerⅢ期），外阴发育正常，阴毛TannerⅢ期，阴蒂无肥大，大、小阴唇着色，发育良好。

为明确诊断应进行的检查项目包括（）

A.骨龄

B.LH、FSH、雌激素

C.子宫、卵巢B超

D.血常规

E.GnRH刺激试验

F.垂体MRI

循环法封窜施工时，将水泥浆顶替至节流器以上10～20m处，待水泥浆刚开始稠化上提封窜管柱。

Cet appartement nous co te trop cher ,nous n’avons pas ____________ de l’acheter.

A．les moyens

B．l’énergie

C．l’ordre

D．l’usage