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【单选题】
74LS138是3/8线译码器，译码器输出为低电平有效，若输入为A2A1A0为100时，8个输出端【图片】的输出为（ ）。A.
11101111
B.
00010000
C.
11110111
D.
11011111
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举一反三
【单选题】—What’s Mike doing? —He’s watching his brother _______.
A.
to swim
B.
to swimming
C.
swims
D.
swimming
【简答题】What’s Steve doing? 2. What’s Rick’s brother doing? 3. What does Steve want Rick’s brother to do? 4. Can Rick take a message for his brother?
【单选题】—What’s your brother doing in his room now?—He ________ a kite.
A.
makes
B.
made
C.
is making
D.
will make
【简答题】听力测试 A)听下面10段对话,回答每段对话后的问题.(每小题1分) 1.How many times does the man go shopping in a month? A.Twice a week. B.eight times. C.Twice. 2.What’s wrong with Jack? A.He has a cold. B.He has a stomachache. C.He...
【单选题】Tom works very hard. His brother, ______, doesn’t do anything at all.
A.
for another thing
B.
what’s worse
C.
on the other hand
D.
even worse
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