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【单选题】
11定义了使用红外、跳频扩频与直接序列扩频技术。802．11b定义了使用跳频扩频技术，传输速率为1 Mbps、2 Mbps、5．5 Mbps与A.
10 Mbps
B.
11 Mbps
C.
54 Mbps
D.
100 Mbps
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A.
to feel
B.
fall
C.
feel
D.
feeling.
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【单选题】You'd better make your own decision ______you've grown up; you shouldn't always depend on your parents.
A.
in that
B.
all that
C.
at that
D.
now that
【单选题】听力原文：W: It is certainly good to hear your voice. When are you coming for a visit? M: Not for a few months, I'm afraid, Mom. But I hope we can come for a few weeks this summer, probably in June. Q: How...
A.
Once a few weeks.
B.
Every month.
C.
Seldom.
D.
Every summer.
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