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【单选题】
折射率与光速的关系是什么？A.
n1/n2=v1/v2
B.
n1/n2=v2/v1
C.
n1n2=v1v2
D.
n=v/c
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【单选题】听力原文：W: I waited until 9:20 for you. M:I must have arrived 6 minutes after you left. What time did the man arrive?
A.
9：20．
B.
9：14．
C.
9：26．
【单选题】听力原文：M: I waited until 10:20 for you. W: I must have arrived 8 minutes after you left. What time did the woman arrive?
A.
10:20.
B.
10:14.
C.
10:28.
【简答题】Passage Two I will always remember my mother‘s last few days in this world. On February 14th , 2000 , my class went on a field trip to the beach. I had so much fun. When we returned to school , my tea...
【单选题】I will always remember my mother’s last few days in this world. On February 14th, 2008, my class went on a field trip to the beach. I had so much fun. When we returned to school, my teacher told me to...
A.
the writer is afraid of her mother
B.
the writer is proud of her mother
C.
the writer feels sad about her mother
D.
the writer feels sorry for her mother
【单选题】I will always remember my mother’s last few days in this world. On February 14th, 2008, my class went on a field trip to the beach. I had so much fun. When we returned to school, my teacher told me to...
A.
famous
B.
free
C.
rich
D.
great
E.
warm-hearted
【单选题】2016 年上半年 下雨天走在被车轮辗过的泥泞路上,晓雪说“爸爸,地上一道一道的是什么呀?”爸爸说:“是车轮压过的泥地儿,叫车道沟。”晓雪说:“爸爸脑门儿上也有车道沟(指皱纹)”。
A.
转导推理
B.
演绎推理
C.
类比推理
D.
归纳推理
【简答题】设有以下关系: 合同(合同号,用户号,用户名,用户地址),合同号是唯一的,则这个关系的范式等级是 ______
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