蜱媒回归热的病原体存在于媒介的
A．唾液与基节液中
B．唾液与胃上皮细胞中
C．体表与血淋巴中
D．基节液与媒介体表
E．上述情况均可能出现
参考答案：A
计算：1000+2-1+（-1）3．
As he was too fat, he tried several shirts _______ but ____ fitted him.
A．on; none
B．in; some
C．on; some
D．in; none
