—Hey, did you enjoy the vacation in London?

—No．Our vacation was totally ruined; not only was the food terrible but the weather was awful        .

A．in the meanwhile

B．as well

C．as a matter of fact

D．in addition

下列关于人体内正常菌群的叙述错误的是（）

A.泛酸等

B.肠道内的正常菌群可合成叶酸、维生素

C.肠道中的乳酸菌、肠球菌等正常菌群可有降低胆固醇的作用

D.菌群失调可导致感染

E.具有免疫调节作用