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【单选题】
( ) is the difference between the values of the goods and services that a country exports and the value of the goods and services that it imports.A.
Trade balance
B.
Trade surplus
C.
Trade deficit
D.
Trade barrier
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【单选题】Hardly (he had) entered (the office) when he realized (that he had) (forgotten his) wallet.
A.
he had
B.
the office
C.
that he had
D.
forgotten his
【简答题】全麻期间保持呼吸道通畅的方法有哪些？
【单选题】词根draw的语义是to draw， 拉、引，withdraw的词义是收回、撤退、撤销，前缀with表示（ ）
A.
with
B.
back
C.
without
D.
towards
【单选题】He left early on the ______ that he had a had toothache and had to see the dentist.
A.
context
B.
contest
C.
pretext
D.
prey
【简答题】保持呼吸道畅通的方法有哪些？
【简答题】保持呼吸道通畅的方法有哪些?
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