铸造牙合支托的宽度为()
A.磨牙颊舌径的1/2
B.磨牙颊舌径的2/3
C.双尖牙颊舌径的1/2
D.双尖牙颊舌径的1/3
E.双尖牙颊舌径的2/3
参考答案:C
The store has _________ the prices. The things there are cheaper than before. [ ]
A. cut
B. put
C. kept
D. keep
生物之间以食物、能量及信息紧密连在一起,从而使生物与环境形成了统一整体.______.