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【单选题】
某单位网络拓扑如图6-11所示，路由器R1～R7均运行OSPF协议。其中，(70)为主干路由器。A.
R3
B.
R1、R2
C.
R6、R7
D.
R3、R6、R7
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举一反三
【单选题】We take pleasure ___ sending you our Enquiry No. 124 for canned fruits.
A.
of
B.
in
C.
on
D.
about
【单选题】To start a practicaltransaction, we take pleasure you a special offer.
A.
to
B.
in
C.
for
D.
of
【单选题】We take pleasure in you a copy of our price-list.
A.
send
B.
sending
C.
sent
D.
to send
【简答题】We take pleasure in placing an order with you for the following items.
【单选题】We take pleasure ______ receiving your offer _____ which we thank you.
A.
of; on
B.
of; for
C.
in; on
D.
in; for
【简答题】We take pleasure in inviting you to come to the anniversary.
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