搜题请搜索小程序“爱下问搜题”
问题 选择题

下列离子方程式书写正确的是（   ）

A．铝粉投入到NaOH溶液中：2Al+2OH-====2+H2↑

B．AlCl3滴入过量NaOH溶液中：Al3++3OH-====Al（OH）3↓

C．NaAlO2溶液中通入少量的CO2：2Al+CO2+3H2O====2Al(OH)3↓+

D．Al2O3粉末溶于NaOH溶液中：Al2O3+2OH-====2+H2O

答案

   D

   铝与碱溶液反应有水参与反应过程；Al(OH)3溶于NaOH中;NaAlO2溶液中通入少量的CO2，最终产物也为碳酸氢钠。

阅读理解

阅读理解。

     In the forest, there is an elephant and a monkey. They're friends. But one day they want to know who is

 stronger (更强壮). One of them says, "Who can get apples over there, who is stronger. "

      There's a river over there. The monkey says, "I can't swim. "The elephant says, "I can swim. Please sit

  on my back. "They go across the river. The apple trees are very high. The elephant can't reach (够着) the

  apples. The monkey climbs (爬) up the tree and gets many apples.

     Now they know they should help each other.

1. The elephant and the monkey want to know _____.

    A. who is smarter

    B. who is higher

    C. who can swim

    D. who is stronger

2. _____ can't swim.

    A. The elephant

    B. The monkey

    C. The big animals

    D. The small animals

3. _____ can't reach the apples.

    A. The elephant

    B. The monkey

    C. The high animals

    D. The short animals

4.  At last the monkey goes across the river with the help of _____.

     A. the elephant

     B. the monkey

     C. an animal

     D. a boat

5. From the story we know that _____.

    A. we should learn from the elephant

    B. we should learn from the monkey

    C. A and B

    D. we should help each other
查看答案
单项选择题

糖原合成的“活性葡萄糖”是

A．ADPG
B．6-磷酸葡萄糖
C．G
D．UDPG
E．1-磷酸葡萄糖
查看答案