推进重庆市统筹城乡改革和发展，如何发展现代农业，推进新农村建设是（）A、优化农业结构

阅读短文判断对(T)错(F)。

      Tom and John are good friends. On Sunday they are in John's room. John's room is very clean (干净的)

and tidy (整洁的). There are two windows in his room. Near the window there is a desk. On the desk there is

an ink bottle (墨水瓶), a lamp and some books. Beside the desk there is a bed. On the wall there is a photo

(照片) of John's family.

( ) 1. Tom and John are friends.

( ) 2. John's room is clean but not tidy.

( ) 3. There are no windows in John's room.

( ) 4. There is a chair and a table in John's room.

( ) 5. A lamp and some books are on the desk.

( ) 6. There is a photo of John's family in the room.

俗话说“螳螂捕蟑，黄雀在后”．它描绘了一个简单的生态系统图，请据图回答：

（1）生产者是______；细菌在生态系统中是______．

（2）黄雀与螳螂的关系是______关系．

（3）消费者与生产者之间的吃与被吃的联系就形成了食物链．那么右图中有______条食物链，可表示为：______．

某无色溶液中，可大量共存的离子组是（　　）

A．Na⁺、HCO₃^-、SO₄^2-、Br^--

B．Cu²⁺、NO₃^-、Cl^-、SO₄^2-

C．H⁺、Cl^-、Na⁺、CO₃^2-

D．Na⁺、Mg²⁺、SO₄^2-、OH^-

心房颤动时在一次长RR间距后出现宽QRS波群，在V₁导联呈rsR′型，提示该QRS波群为（）。

A.室性期前收缩

B.室内差异性传导

C.预激综合征合并心房颤动

D.室性心动过速

E.预激综合征

下列各图象能正确反映所对应的实验事实的是

A． 充分加热等质量的氯酸钾制氧气

B． 往稀硫酸中加入氯化钡溶液至过量

C． 滴加稀盐酸恰好中和pH=13的氢氧化钾溶液

D． t℃向某接近饱和的硫酸钠溶液中缓慢加入硫酸钠粉末（a%为该溶液溶质质量分数）