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【单选题】
计数器是一种时序逻辑电路，通常必须由什么构成（ ）。A.
门电路
B.
触发器
C.
门电路和触发器
D.
计数器
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举一反三
【单选题】We are supposed to plant more trees. They help to the wind and sand. [ ]
A.
keep away
B.
keep out
C.
keep up
D.
keep off
【单选题】As students, we are supposed to spend more time ______. [ ]
A.
study
B.
studied
C.
studying
D.
to study
【多选题】C54x DSP的CPU有多个运算单元,累加器是其重要组成部分,请指出以下选项中哪些是C54x DSP的累加器?
A.
A、 累加器A
B.
累加器B
C.
累加器C D、
D.
累加器D
【单选题】听力原文：We are supposed to do our assignments for statistics on the computer, but those in the student center are always tied up. I'm plfanning to get my own soon. (29)
A.
Our assignment can hardly be completed without a computer of my own.
B.
The statistics in the student center are messed up, thus making our assignment difficult to complete.
C.
I'm planning to finish my own assignment as soon as possible.
D.
Our assignment has to wait till the computers in the student center get repaired.
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