阅读理解。

There are four seasons in a year.  They are spring, summer, autumn and winter.  It's warm in spring. We

can go out to play. It's rainy and hot in summer. In autumn, the leaves(树叶) turn yellow.  It snows in

winter. We can make snowmen.  Winter is my favourite season.

1.  How many seasons in a year?

A. Four.        

B. Five.        

C. Three.

2. In __________,we can go out to play. It's warm.

A. summer      

B. spring      

C. winter

3. It's hot in summer. It's _______,too.

A. cool        

B. rainy      

C. snowy

4. The trees are yellow in ___________. 

A. spring      

B. autumn      

C. winter

5. I like _____________best.

A. winter      

B. autumn      

C. spring

下列各组离子在给琮条件下能大量共存的是 [ ]

A．在pH=1的溶液中：NH₄⁺、K⁺、ClO^-、Cl^-

B．有SO₄^2-存在的溶液中：Na⁺、Mg²⁺、Ca²⁺、I^-

C．有NO₃^-存在的强酸性溶液中：NH₄⁺、Ba²⁺、Fe²⁺、Br^-

D．在c(H⁺)=1.0×10^-13mol·L^-1的溶液中：Na⁺、S^2-、AlO₂^-、SO₃^2-