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问题 单项选择题

She took a short cut（）the fields.

A.through 

B.over 

C.below 

D.across

答案

参考答案：D

单项选择题

服用甾体避孕药后可引起对下丘脑、垂体的持续性抑制，子宫内膜不应为

A．子宫内膜腺体增生

B．静止型子宫内膜

C．分泌型子宫内膜

D．萎缩型子宫内膜

E．有时甚至腺瘤性增生
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单项选择题

Asynchronous Transfer Mode (ATM) is a (16) that promises to change the fabric of local and wide area communications.

The key advantage of ATM is the capability to move voice, data, graphics and (17) at speeds of up to 2 gigabits per second.

An ATM switch allows you to create a (18) network that is completely independent from the (19) configuration of the network.ATM uses a (20) called cell switching to convert data into fixed length cells of 53 bytes each, so they can be switched very quickly and efficiently.

（17）是（）

A. technology

B. video images

C. logical

D. physical
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