辽、北宋均亡于哪个 * * [ ] A、金 B、西夏 C、蒙古 D、元朝

STR(123.45,5,1)命令的输出结果是( )。

A．123.4

B．123.5

C．123.45

D．*****

下列诗句按其所描写节日的先后顺序，排列正确的是（）。 ①桃符呵笔写，椒酒过花斜 ②九日黄花酒，登高会昔闻 ③粽包分两髻，艾束著危冠 ④马上逢寒食，途中属暮春

A.④②③① 

B.①④③② 

C.②④③① 

D.③①②④

It was still _____ range of my gun, _____ I didn't want to shoot at it any longer. [ ]

A. out of; but

B. beyond; however

C. within; but

D. on; so

The child with rheumatic fever must have his heart rate measured while awake and while sleeping. Why are two readings necessary ？（）

A．To obtain a heart rate that isn't affected by medication.

B．To eliminate interference from the jerky movements of chorea.

C．To ensure that the child can't consciously raise or lower the heart rate.

D．To compensate for the effects of activity on the heart rate.

物流能力是构成企业核心竞争能力的重要因素，其发展的快慢将影响着企业在市场上的竞争优势的形成。