什么是ATM？
参考答案：
ATM是异步传输方式的简称。以信元为信息传输、复接和交换的基本单位的转送方式。
试述影响乙烯生物合成的因素。
Since I have read quite a few English books, I know ______words and phrases, of which the majority______ been found in our textbook.
A．a good many; haven’t
B．a great deal of; haven’t
C．the number of; hasn’t
D．a number of; hasn’t
