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【单选题】
IP地址中的第一个8位组高端首位总是二进制0,其余7位表示网络ID号,除去,全1外,其网络ID有效值范围为001~126。第二,三,四个8位组,共24位用于宿主机ID。这类IP地址属于A.
A类地址
B.
B类地址
C.
C类地址
D.
D类地址
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反馈参考答案：
举一反三
【判断题】Writers should be careful to give only good characteristics to their protagonists.
A.
正确
B.
错误
【单选题】---Be careful, don’t forget to follow your father. ---I know that, Mum. One can never be too careful.
A.
and
B.
or
C.
but
D.
so
【单选题】He often tells the children _____ when they play water sports. [ ]
A.
be careful
B.
to be careful with
C.
to be careful
D.
not be careless
【单选题】—Be careful not to drop the Tang Dynasty vase . —Yes , we can’t be .
A.
too careful
B.
very careful
C.
too careless
D.
careless enough
【单选题】It's important ______ fire. [ ]
A.
to care
B.
be careful
C.
to be careful
D.
to be careful with
【单选题】What did Helen have to be careful to hide?
A.
Her lack of interest in history.
B.
Her low opinion of her husband's writing.
C.
Her dislike of her husband's admirers.
D.
Her inability to understand his books.
【单选题】Be careful to move the equipment --- ______ it gently.
A.
doing
B.
do
C.
to do
D.
done
相关题目：
【单选题】It's important ______ fire. [ ]
A.
to care
B.
be careful
C.
to be careful
D.
to be careful with
参考解析：
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