— Have you called Mr. Johnson’s office?

— Yes, he _____ back before tomorrow. So he can attend our meeting on time.

A．expected

B．is expected

C．is expecting

D．is to expect

婴幼儿疟疾的特点有（）

A.发热不规则，呈弛张热或稽留热

B.常有呕吐、腹泻，以致感染性休克或惊厥

C.脾大显著

D.贫血、血片中可查到大量疟原虫

E.病死率低