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【单选题】
( 经典题, 6 分 ) PH 3 是一种无色剧毒气体,其分子结构和 NH 3 相似,但 P—H 能比 N—H 能低。下列判断错误的是 ( )A.
． PH 3 分子中存在极性共价键
B.
． P—H 长比 N—H 长长
C.
． PH 3 沸点低于 NH 3 沸点，因为 P—H 能低
D.
． PH 3 分子稳定性低于 NH 3 分子，因为 N—H 能高
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举一反三
【单选题】— ______ that he picked up his uncle at the airport? — It was at 6:00 in the afternoon ______ he got off work. [ ]
A.
Was it when; that
B.
When was it; that
C.
Was it when ; when
D.
When was it; when
【单选题】When he saw a wallet on the playground , he at once .
A.
picked it up
B.
gave it up.
C.
picked up it.
【单选题】--- _______ that he picked up French? --- It was in 2010 _______ he traveled in France.
A.
Was it when; that
B.
When was it; that
C.
Was it when; when
D.
When was it; when
【单选题】After_____a11 the apples，he____ the biggest one in the basket and handed it to me．
A.
picked；picked up
B.
picking；picked out
C.
picking Out；picked
D.
picking up；picked
【单选题】He ______ the phone expecting to hear the chairman's gruff voice. A. picked up B. picked at C. picked on D. picked out
A.
picked up
B.
picked at
C.
picked on
D.
picked out
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