如图1表示生长素浓度对植物根、芽和茎生长的影响。请回答下列问题。C点对应的生长素浓度

关于瑞氏染色嗜碱性粒细胞形态的叙述，错误的是（）

A.直径10～12μm，略小于中性粒细胞

B.细胞浆颗粒量少，大小不均，染蓝黑色

C.胞质较少，常呈淡红或淡紫色

D.嗜碱性颗粒易溶于水，制片染色时不易脱失

E.细胞核常被颗粒遮盖，着色较浅

期前收缩之后出现代偿间歇的原因是

A．窦房结节律性兴奋延迟发放

B．窦房结节律性兴奋少发放一次

C．窦房结节律性兴奋传出速度减慢

D．期前收缩的有效不应期延长

E．窦房结的一次兴奋落在期前收缩的有效不应期中

小腿骨折适用( )

A．皮肤牵引
B．跟骨牵引
C．骨盆悬吊
D．骨盆牵引
E．颅骨牵引

IEEE 802标准中，______规定了LAN参考模型的体系结构。

A．802.1
B．802.3
C．802.4
D．802.6

Looking back on my childhood, I am convinced (1) naturalists are born and not made. Although we were all brought (2) in the same way, my brothers and sisters soon gave up their pressed flowers and insects. (3) them, I had no ear (4) music and languages, I was not an early reader and I could not do mental arithmetic.Before World War I we (5) our summer holidays in Hungary. I have only the memory of the house we lived (6) , of my room and my toys. I can hardly (7) clearly the large family of grandparents, aunts, uncles and cousins who gathered (8) door. But I do have a clear memory of the dogs, the farm (9) , the local birds and, (10) all, the insects.I am a (11) , not a scientist. I have a p (12) of the natural world, and my enthusiasm has led me into varied investigation. I love discussing my favorite topics and enjoy (13)  the midnight oil  (14)  reading about other people’s observations and discoveries. Then  (15)  happens that brings these observations together  (16)  my conscious mind. Suddenly you fancy (想象), you see the answer  (17)  the riddle, and books, of which some might honor with the title of scientific research.But curiosity, a keen eye, a good memory and enjoyment of the animal and plant world do not make a scientist; one of the outstanding and essential  (18)  required is self-discipline, a quality I lack. A scientist requires not only  (19)  but also hard training, determination and a goal. A scientist, up to a point, can be made. A naturalist is  (20) . If you can combine the two, you get the best of both worlds.

第（16）空应选择（）

A．of

B．on

C．to

D．over