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【单选题】
破骨细胞的主要特点是A.
呈梭形，胞质弱嗜碱性
B.
不断分裂成多核细胞
C.
降钙素能增强其活动
D.
胞质内可见吸收的骨质
E.
溶解和吸收骨质
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举一反三
【单选题】The Chinese people are busy _______ the Spring Festival now.
A.
preparing for
B.
to prepare for
C.
to prepare
【单选题】The early spring frost sweeping over the north area now is sure to cause ________ of fruits this year.
A.
liability
B.
invalidity
C.
scarcity
D.
novelty
【单选题】The Chinese people are busy _____ the Spring Festival now. [ ]
A.
to prepare for
B.
preparing for
C.
to prepare
【单选题】Just now a strange idea() in her mind.
A.
springed up
B.
sprang up
C.
sprung up
D.
spring up
【简答题】It ________ spring now.
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