题目内容

某人的同父异母弟弟患先天性聋哑(AR),她与其姨表兄(弟)结婚,所生子女为先天性聋哑的风险是

A. 1/16
B. 1/24
C. 1/36
D. 1/48
E. 1/64

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Decide if the following statements are True (T) or False (F).___ 1. In January, Reykjavik is colder than New York City._ 2. The language of Iceland is English._ 3. Icelanders get their hot water from the ground._ 4. Fish is expensive in Iceland._ 5. Icelanders read a lot of books.___ 6. Children in Iceland work during school vacations.

Complete these sentences with the words or phrases in the box.a quarter of crime high quality of lifesimilar tocapital heatisland temperature1. Iceland is a(n)______, but it is also a country.2. About _ a million people live in Iceland.3. Iceland’s language is German.4. In Iceland, people use hot water from the ground to their homes.5. There are few people in prison in Iceland because there is almost no _.6. Icelanders like a(n) _, so they work very hard.7. Reykjavik is the of Iceland.8. In winter, the _____ in Reykjavik is the same as in New York City.

创建主键约束的时候，主键只能绑定到表的一个列上。

A. 对
B. 错

完成课本案例7的程序的编写，并将代码及结果上传。希望同学们能够通过此案例掌握自增与自减的用法与含义。