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【单选题】
从下列关于存储器管理功能的论述中，正确的是（ ）。A.
即使在多道程序设计的环境下，用户也能设计出用物理地址直接访问内存的程序
B.
内存分配最基本的任务是为每道程序分配内存空间，其所追求的主要目标是提高存储空间的利用率
C.
为了提高内存保护的灵活性，内存保护通常由软件实现。
D.
交换技术已不是现代操作系统中常用的技术。
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【单选题】听力原文： For those of us lucky enough to always have enough food and water, it may be hard to imagine living through a drought. A drought occurs for a variety of reasons, usually including a lack of rain...
A.
cools
B.
air rises
C.
deserts
D.
warm
【单选题】The passage implies that it is easy to buy the following things in the country EXCEPT______.
A.
daily necessities
B.
fruits
C.
designer clothes
D.
vegetables
【单选题】It is very important ＿＿＿people to have food and water every day.
A.
for
B.
of
C.
with
D.
about
【单选题】Which of the following things is NOT included in the process of application for membership?
A.
Fill in an application form.
B.
Get the application form. stamped at one's work unit.
C.
Pay a deposit.
D.
Pay library fee.
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