呕吐伴眩晕、眼球震颤最可能是（）。
A.急性胃肠炎
B.前庭器官疾病
C.青光眼
D.脑膜炎
E.肾绞痛
参考答案：B
—What are you going to do this Sunday?
—John has planned a big party on Sunday and many friends _______ to take part in. [ ]
A. will invite
B. has invited
C. will be invited
D. has been invited
通常正常动物细胞中不具有的酶是[ ]
A．复制DNA所需的酶
B．转录合成RNA所需的酶
C．翻译合成蛋白质所需的酶
D．逆转录合成DNA所需的酶
