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【单选题】

$\lim_{x\to \frac{\pi }{3}} \, \frac{\sin (x)}{\cos (x)+1}$

A.
$\frac{1}{\sqrt{3}}$
B.
$-\frac{1}{\sqrt{3}}$
C.
$\frac{1}{2}$
D.
$-\frac{1}{2}$
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参考答案:
参考解析:
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【单选题】Why does the memory becomes smaller and smaller?内存“越来越小”的原因是:

A.
With more and more processes running on one computer, the average memroy size for each process is getting smaller 机器上运行的程序越来越多,平均每个程序使用的内存变小
B.
The real-world applications call for rocketing memory storage 实际应用对存储的需求急剧增长
C.
The silicon used for producing chips is soon running out 用于制造内存芯片的硅资源消耗殆尽
D.
The physical size of memory chips is getting smaller thanks to the advances in technology 随着工艺的进步,内存的体积变小,集成度变高

【单选题】How to engage in other people’s discussion in a seminar when you are not fully prepared?

A.
Follow the lecture closely and look for opportunities to ask relevant questions.
B.
Pretend you’re fully prepared and listen carefully
C.
Ask people around for help
D.
Record all the lecture and learn it later by yourself

【单选题】The baby carrying the DNA of three parents is an experimental specimen, aiming at ______.

A.
having more babies
B.
having babies with genetic modification
C.
eliminating genetic diseases in newborns
D.
innovating in the field of life science
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