鸳鸯蝴蝶派代表作家有()、()、()、()。
参考答案:包天笑;徐枕亚;周瘦鹃;李涵秋
It is believed that a new kind of drug ______ by the scientists and they are hopeful that they
will succeed in a couple of months. [ ]
A. has been developed
B. is being developed
C. is developing
D. has developed
新生儿长期给氧应注意什么?