伤寒慢性带菌者的致病菌检出率高的标本是（）
A.血液
B.粪便
C.胆汁
D.咽漱液
E.尿液
参考答案：C
Though he was unhappy yesterday, he still did all the housework _____. [ ]
A. by the way
B. as usual
C. as well
D. as a result
by beautiful green mountains and situated at the foot of Huangshan Mountain makes Tai Ping Lake
a famous tourist attraction. [ ]
A. Surrounded
B. Being surrounded
C. Having been surrounded
D. Surrounding
