欲使P1口的低4位输出0, 高4位不变, 应执行一条____指令。(4.0)
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One of our customers is in the market __________Chinese white tea.
A. of
B. for
C. on
D. in
We would ______ very much if you send us some samples immediately.
A. appreciate
B. appreciate it
C. appreciated
D. appreciate you
Our company has 20 years' experiece _____ the machinery line.
A. on
B. in
C. about
D. of
We are ______that our catalogue will give you all the details you require.
A. confident
B. in confidence
C. confidential
D. confidentially
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