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【单选题】
关于骨髓叙述中,正确的是A.
红骨髓和黄骨髓都有造血功能
B.
红骨髓主要由脂肪细胞组成
C.
黄骨髓主要由造血细胞组成
D.
白骨髓主要为支架细胞
E.
新生儿全身骨髓均为黄骨髓
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举一反三
【单选题】The millions of calculations involved, ______ by hand, would have lost all practical value by the time they were finished.
A.
had they been done
B.
having been done
C.
they had been done
D.
they were done
【单选题】许多人一谈起爱国，往往会联想到金戈铁马，血洒疆场。实际上，在和平年代，爱国体现在生活的每一个细节当中。爱国不仅是一种信念，更是一种行动。当前，在中国经济面临严峻挑战之时，努力工作、积极消费就是爱国。这说明（）
A.
爱国主义是抽象的
B.
爱国主义是具体的
C.
在当代中国，爱祖国与爱社会主义是一致的
D.
发展中国特色社会主义，拥护祖国统一，是新时期爱国主义的主题
【单选题】The millions of calculations involved, had they been done by hand, ______ all practical value by the time they were finished.
A.
could lose
B.
might lose
C.
would have lost
D.
ought to have lost
【单选题】The millions of calculations involved, ______ by hand, would have lost all practical value by the time they were finished.
A.
had they been done
B.
they had been done
C.
having been done
D.
they were done
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