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Can dolphins talk ? Maybe they can’t talk with words ,but they can talk with sounds . They show their feelings with sounds . Dolphins travel in group . We call a group of them a “school “. They don’t study , but they travel together. Dolphins talk to other dolphins in the school .They give information . They tell other dolphins when they are happy or sad or afraid . They say “welcome “when a dolphin comes back to the school . They talk when they play . They make a few sounds above water . They make many more sounds under water . People can hear these sounds because they are very high . Sometimes people catch dolphins for large aquariums . People can watch the dolphins in a show . Dolphins don’t like to be in the aquarium , being away from their school . They are sad and lonely if they do so . There are many stories about dolphins . They help people . Sometimes they save someone’s life . Many people believe that dolphins can bring good luck . 小题1:Dolphins show their feelings with ________. A.pictures B.words C.waves D.sounds 小题2:Dolphins __________ in the school according to the passage. A. give information B.don’t tell other dolphins when they are afraid C. talk when they sleep D.say “ sorry” when a dolphin comes back 小题3:People can’t hear the dolphin’s sounds because ______________> A.they are above the water B.they are under the water C.they are very high D.they are very low 小题4:Many people believe that dolphins can bring_______________. A.good luck B.health C.wealth D.danger 小题5:Which of the following is TRUE ? A. Dolphins study in the school. B.Dolphins travel in a group. C.Dolphins like to be away from their school. D.Dolphins sometimes kill people.
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【单选题】在Excel 中,设单元格A1中的值为0,B1的值为60,若在C1单元格中常规格式下输入函数“ =ROUND(AVERAGE:(AB11),2) ”,按回车键, C1单元格的值为( )。
A.
30
B.
30.00
C.
70
D.
70.00
【简答题】Excel 2000工作表中,单元格Cl至C10中分别存放的数据为l,3,5,7,9,11,13,15,17,19,在单元格C12中输入了AVERAGE(C1:C10)函数,则该单元中的值是()
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A.
特异性抗原
B.
非特异性抗原
C.
无抗原
D.
特异性和非特异性抗原
E.
红细胞血型系统共有抗原
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A.
12
B.
10
C.
14
D.
11
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A.
正确
B.
错误
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A.
血管内皮细胞特异性抗原
B.
HLA
C.
肾特异性抗原
D.
心脏特异性抗原
E.
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A.
肿瘤特异性抗原是肿瘤细胞特有的
B.
肿瘤特异性抗原也可存在于正常细胞
C.
肿瘤特异性诱导的主要是T细胞免疫
D.
一般通过动物肿瘤移植排斥试验证实
E.
可诱导机体产生免疫排斥反应
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A.
CD3
B.
CD4
C.
CD5
D.
CD6
E.
CD8
【简答题】切向加速度是 的一阶导数。
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