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【单选题】
下列情况中属于封闭体系的是A.
用水壶烧开水
B.
氢气在氯气的密闭绝热容器中燃烧
C.
氢氧化钠与盐酸在烧杯里反应
D.
反应 N 2 O 4 (g) === 2 NO 2 (g) 在密闭容器中进行
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举一反三
【单选题】What will happen tomorrow?
A.
The man will leave for Europe.
B.
The man will meet with the artist.
C.
The man will give a presentation.
D.
The man will receive some posters.
【单选题】Paul will leave for London next Tuesday. -But unless he( ) next Monday, he’ll be late.
A.
leaves
B.
will leave
C.
left
D.
has left
【单选题】___ he will leave for Beijng.
A.
It will not be long before
B.
It is before long that
C.
It is before long
D.
It was before long that
【单选题】—Mum, I will leave for tha party. —Remember your .thank your friend when you leave the party.
A.
action
B.
polite
C.
manner
D.
manners
【单选题】Miss Wang _____ Canada yesterday. [ ]
A.
is leaving for
B.
leave for
C.
left for
D.
will leave for
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