美国德克萨斯仪器公司的年轻电子工程师基尔比,首先发明了能够包容晶体管和电阻、电容等元件的()
A.数字电路
B.集成电路
C.数码电路
D.电子电路
参考答案:B
She is a vegetarian. She will __________ if you mention eating meat in front of her.
A.fall over the moon
B.be down in the dumps
C.get hot under the collar
D.laugh her head off
草履虫与细菌都具有的细胞器是[ ]
A.核糖体
B.线粒体
C.核膜
D.染色体