光合作用和化能合成作用的相同点是（）
A.都能把无机物转变成有机物
B.都需要太阳光能
C.都需要无机物氧化供能
D.都需要利用氧气
参考答案：A
You’d better not phone me between two and six o’clock this afternoon; I ___
a speech then.
A．will give
B．will have been giving
C．will be giving
D．will have given
试画出HDLC的长帧格式。
