胸12椎体压缩性骨折石膏固定的方法为（）。 A.石膏腰围 B.石膏背心 C.头颈胸石

My name is Peter and I’m 12 years old. I don’t have a brother or a sister. I am in No.2 Middle School. My parents are Gray and Nancy Wilson. My father is a worker and my mother is a music teacher.

My father’s parents are David and Jacy Wilson. They don’t live with us. They live in the nearby city（附近的城市）. David is 63 and Jacy is 61. They come to see us once a month（一个月一次）.

My mother’s parents are Henry and Sara Smith. Henry is 62 and Sara is 58. They are farmers. They have a farm. They grow vegetables and rice（种植蔬菜和水稻）. I like to go to see my grandparents.

小题1:How many children do Gary and Nancy Wilson have?

A．One.

B．Two.

C．Three.

D．Four.小题2: Nancy Wilson is a(n)         .

A．worker

B．music teacher

C．farmer

D．We don’t know小题3:        is Nancy Wilson’s father.

A．David Wilson

B．Jacy Wilson

C．Henry Smith

D．Sara Smith小题4: How old is Jacy Wilson?

A．63.

B．58

C．62.

D．61.小题5:Who has a farm?

A．Mr. and Mrs. Wilson.

B．Peter’s parents.

C．Mr. and Mrs. Smith.

D．Nobody.

氮化硅(Si₃N₄)是一种新型陶瓷材料，它可由石英与焦炭在高温的氮气流中通过以下反应制得

(1)配平上述反应的化学方程式(将化学计量数填在方框内)；

(2)该反应中的氧化剂是________，其还原产物是________；

(3)该反应的平衡常数表达式为K＝________；

(4)若知上述反应为放热反应，则其反应热ΔH________零(填“大于”“小于”或“等于”)；升高温度，其平衡常数值________(填“增大”“减小”或“不变”)；

(5)若使压强增大，则上述平衡向________反应方向移动(填“正”或“逆”)；

(6)若已知CO生成速率为v(CO)＝18 mol/(L·min)，则N₂消耗速率为v(N₂)＝________mol/(L·min)．

某校甲、乙两支仪仗队员的身高（单位：cm）如下：

甲队：176 175 175 174 176 175；乙队：170 180 178 175 180 176

你认为身高更整齐的球队是______队．

关于税收实体法要素，下列说法中正确的是( )。

A．税收附加和税收加成是减轻纳税人负担的措施

B．在累进税率条件下，边际税率等于平均税率

C．车辆购置税属于按年计征，分期预缴或缴纳

D．如纳税期限的最后一天是法定节假日，或纳税期限内有连续3日以上法定节假日，都可以顺延

The old lady likes to keep things in the house, _____ throw them away, though many are useless.

A．more than

B．but also

C．as if

D．rather than