人们常用“以菌治虫”的方法来杀灭害虫，防治松毛虫最有效的微生物是[ ]
A．白僵菌
B．放线菌
C．酵母菌
D．乳酸菌
答案：A
. The concert was a great success--there wasn’t a single empty seat in the concert hall, ____ it was very cold.
A．because
B．when
C．unless
D．although
具有脉体宽大，来盛去衰特点的脉象是()
A.大脉
B.芤脉
C.洪脉
D.实脉
E.牢脉
