β受体阻滞剂在冠心病的二级预防中的作用已得到公认，其作用机制哪项是错误的（） A.减

阅读理解。

     Welcome to this short tour of London. In this square we are standing in the middle of London. Opposite

is the National Gallery, a museum with lots of famous paintings. Go along the red street to Buckingham

Palace. The queen lives here.

     Turn left and go to the Houses of Parliament and Big Ben. Opposite you can see the London Eye. It takes

you 135 meters above the River Thames. You can see most of London on a clear day.

     When you are tired, the best way to see London is by boat. You can get the boat near Big Ben. As you go

along the river, the London Eye is on your right.

     Get off the boat at Tower Bridge. Then you can see the Tower of London next to the bridge. The Tower

of London is the city's oldest palace. It is nine hundred years old.

     Take the boat back along the river. Get off the boat and go past the station and walk along the street.

Opposite is the old fruit and vegetable market. They don't sell fruit and vegetables now. There are stores and

restaurants, and lots of street musicians. Turn left into King's Street, and go past the church. You're now

back where you started, at the square. Now you finish your tour.

1. _____ is London's oldest palace.

A. The Tower of London

B. The National Gallery

C. Buckingham Palace

D. The Houses of Parliament

2. _____ is the London Eye.

A.  B.  C.  D.

3. You will not go past _____ on your way back.

A. the park

B. the square

C. the station

D. the church

某一氧化物含有n种元素，而某一含氧化合物含有m种元素，则m与n的关系为（　　）

A．n=m

B．n＜m

C．n＞m

D．n≤m

下面哪些是影响接触电阻的因素（）

A、表面状态

B、电极压力

C、焊件材料的性质

D、加热温度

庭审过程中，被告人赵某指出，公诉人的书记员李某曾在侦查阶段担任鉴定人，并据此要求李某回避。对于赵某的回避申请，下列哪一选项是正确的

A．法庭应以不属于法定回避情形为由当庭驳回
B．法庭应以符合法庭回避情形为由当庭做出回避决定
C．李某应否回避需提交法院院长决定
D．李某应否回避需提交检察院检察长决定