在四支试管中分别加入一些物质，甲试管：豆浆；乙试管：氨基酸溶液；丙试管：牛奶和蛋

把一个圆柱体的侧面展开，得到一个正方形，已知正方形的周长是50.24厘米，那么圆柱体的表面积是______平方米．

—All of us are proud of the progress he’s made during the past few years.

—Yes, we’re sure he will be even ______.[ ]

A. successful  

B. more successful  

C. most successful    

D. successfully

基础体温测定，停经后体温升高多少天不见下降，早孕的可能性大（）

A.7天

B.10天

C.14天

D.18天

E.30天

第一批动物检疫国家标准包括（）。

A、畜禽产地检疫规范

B、新城疫检疫技术规范

C、猪瘟检疫技术规范

D、猪丹毒检疫技术规范

In (66) the strength of the carder signal is varied to represent binary 1 or 0. (67) is a system that can map a name to an address and conversely an address to an name. (68) is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol. (69) is an approach that enables an ATM Switch to behave like a LAN switch. (70) is an guided media which is made of glass or plastic and transmits signals in the form of light.

A．Coaxial cable

B．Optical fiber

C．Unshielded Twisted-pair Cable

D．Shielded Twisted-pair Cable