下列哪种维生素缺乏可使成釉细胞不能分化成高柱状细胞而蜕变成扁平细胞进而造成牙釉质发育
题型：单项选择题
问题：
下列哪种维生素缺乏可使成釉细胞不能分化成高柱状细胞而蜕变成扁平细胞进而造成牙釉质发育不全
A．维生素E
B．维生素D
C．维生素C
D．维生素B
E．维生素A
题型：单项选择题
根据下列句子所给首字母在横线上写出空缺处各单词的正确形式。（每空只写一词）
小题1:He drew a ____________（结论）after a lot of experiments.
小题2:Word came that our football team was _____________ （打败）again.
小题3:Who do you think is to ____________（该受指责）for the accident?
小题4:What he did was not ________ （与……一致）with what he said.
小题5:England is divided __________ (粗略地) into three zones.
小题6:At first my new __________ (环境) were difficult to tolerate.
小题7:If it is _____________（方便的）to you I’ll be with you next Tuesday.
小题8: Please ________（安排） for a taxi to p
ick me up at six o’clock.
小题9:To their __________（高兴）, their son was
admitted into a famous university.
小题10:Wang Ping ________(系好) my safety belt and showed me how to use the hovering carriage.
小题11: Being ______（暴露）to sunlight 
for too much time will do harm to one’s skin.
小题12:With extra evidence John Snow was able to______(宣布) with certainty that polluted water
carried the virus.
小题13:For hi
storical__________ (建筑) ,you have to go to older but smaller towns built by the Romans.
小题14:Just as I tried to make the necessary ________(调整)to this new situation, Wang Ping appeared.
小题15:Westminster Abbey contains ________(雕塑) in memory of dead poets and writers.