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【单选题】
关于巨幼细胞贫血叙述不正确的是（）A.
巨幼细胞贫血是缺乏叶酸或维生素B 12
B.
婴幼儿添加辅食不当可造成该病
C.
巨幼细胞贫血时可伴随白细胞和血小板减少
D.
叶酸的缺乏主要影响细胞RNA合成
E.
巨幼细胞贫血的患者可常感远端肢体麻木
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举一反三
【单选题】I _____ to help you but I was not able to spare any time. I _____a paper last night and I’ll have to finish it today.
A.
wanted; have been writing
B.
had wanted; was writing
C.
had wanted; wrote
D.
have wanted; wrote
【单选题】It's _____ book that I keep _____ it in my free time. [ ]
A.
so a meaningful; reading
B.
such a meaningful; read
C.
so a meaningful; read
D.
such a meaningful; reading
【单选题】I ________ to help you with your homework, but I couldn’t spare any time. I ________ a composition last night and I’ll finish it today.
A.
wanted; wrote
B.
had wanted; was writing
C.
have wanted; wrote
D.
wanted; have been writing
【单选题】What cause our lack of confidence in this purchase are the______ of the machine: large consumption of energy, need of frequent maintenance and high price.
A.
merits
B.
handicaps
C.
bruises
D.
drawbacks
【单选题】I _____ to help you to do homework but I couldn’t spare any time. I _____ a composition last night and I’ll finish it today.
A.
wanted; wrote
B.
had wanted; was writing
C.
have wanted; wrote
D.
wanted; have been writing
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