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【单选题】
可进行造血干细胞采集的时机为外周血中 CD34+ 细胞的数量达到:A.
(20~40) x 106/L
B.
(20~40) x 105/L
C.
(20~40) x 107/L
D.
(2~4) X 106/L
E.
(2~4) x 105/L
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【单选题】— How did you play in the match? — Well, our team was ahead by 2 to 0 during the first half, but we _____ in the last ten minutes. [ ]
A.
had lost
B.
have lost
C.
were losing
D.
lost
【简答题】Our team was ahead during the first half, but we _____ in the last ten minutes. A. had lost B. would lose C. were losing D. lost
【单选题】下列有关金属性质的说法错误的是：（ ）
A.
常温下所有金属都是银白色的固体
B.
在空气中灼烧铜丝，其表面会变黑
C.
铜、银等金属具有良好的导电性
D.
埋在潮湿、疏松、透气的酸性土壤中的铸铁管容易被腐蚀
【单选题】Our team was by their team in the football game yesterday.
A.
defeated
B.
won
C.
gained
D.
earned
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