流行性乙型脑炎病毒传播环节中最重要的中间宿主是
A．蚊
B．幼猪
C．成年猫
D．乙型脑炎带毒者
E．虱
参考答案：B
—Jane and July are here. Did I introduce them to you?
—No，you didn’t. I’ve seen them，but we__________.
A．hadn’t been introduced
B．haven’t been introduced
C．weren’t introduced
D．didn’t introduce
血液中糖皮质激素主要受控于下列哪种激素的调节
A．促甲状腺激素B．生长激素C．促肾上腺皮质激素D．催乳素E．去甲肾上腺素
