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【单选题】
干细胞是一种尚未充分分化的未成熟细胞，它具有再生各种组织、器官的潜能，医学家们正尝试利用干细胞治疗一些顽疾，如用骨髓移植法有效治疗白血病便是成功的例证。下列说法中不正确的是 [ ]A.
造血干细胞在骨髓中可分化发育成T淋巴细胞和B淋巴细胞
B.
利用干细胞治疗某些顽疾，是因为干细胞的分化程度低，其全能性较高
C.
骨髓移植时必须是供者与受者的主要HLA有一半以上相同
D.
异体骨髓移植成功后，的血型有可能发生改变但不会遗传
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举一反三
【单选题】______ Chemistry is a branch of Chemistry.
A.
Applying
B.
Apply
C.
Applied
D.
Applicant
【单选题】Why was the writer pleaded with to take chemistry or biology?
A.
Beause her professor in Yale advised her to take chemistry or biology.
B.
Because her mother attempted to persuade her to take chemistry or biology.
C.
Because she was from China.
【简答题】有人说：“因为海水含盐量高，所以海水中溶氧含量比淡水的低”。你认为这种说法对不对？
【简答题】A．Chemistry isn't hard for him. B．Physics is easy for him. C．Chemistry is easier than Physics for him. D．Physics is easier than Chemistry for him.
【单选题】What is analytical chemistry?
A.
The study of how chemicals react
B.
The analysis of other chemistry studies
C.
The identification, isolation, and measurement of chemicals
D.
The most advanced form of chemistry
【单选题】—Is chemistry more difficult than physics? — No, chemistry isn't as _____ as physics. [ ]
A.
easy
B.
difficult
C.
easier
D.
more difficult
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