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【单选题】
婴幼儿吃蛋.奶等食物,保证维生素D的摄入,以防止因维生素D缺乏而引起( ) 2014上 184A.
呆小症
B.
异嗜癖
C.
佝偻病
D.
坏血病
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举一反三
【简答题】A．They want to stay home and do the housework. B．They have too much work and not much free time. C．They don't have enough money. D．They have more than in the past.
【单选题】Too much work and too little rest ____ to his illness.
A.
causes
B.
forms
C.
leads
D.
makes
【单选题】Too much work and too little rest bad health.
A.
lead to
B.
leads to
C.
result in
D.
result from
【单选题】Too much work and too little rest often( ) illness.
A.
used to
B.
lead to
C.
object to
D.
stick to
【简答题】短周期的四种主族元素W、X、Y、Z，原子序数依次减小，四种元素的原子核外电子层数之和为8。X元素的原子最外层电子数等于Y和Z两元素的原子最外层电子数之和。W元素和Y元素的原子最外层上的电子数分别是各自电子层数的2倍，X和Z可以形成XZ 3 的化合物。 （1）写元素名称： X______，Y______Z_______ ，W在周期表的位置是：_______ （2）（XZ 4 ） 2 W的电子式___...
【简答题】Too much work and too little rest often leads to (ill) ______.
【简答题】Too much work and too little rest was led to his uncle’s death . A B C D
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