—Could you tell me what time the train leaves Hefei for Beijing?

—I'm afraid you need to            on the Internet. [ ]

A. look for it

B. look at it

C. look it over

D. look it up

心电图运动试验阳性是指心肌负荷增加后出现

A．ST段水平或下斜型压低≥0.05mV
B．ST段水平或下斜型压低≥0.1mV
C．ST段水平或下斜型压低≥0.05mV，持续0.08s
D．ST段水平或下斜型压低≥0.1mV，持续0.08s
E．ST段水平或下斜型压低≥0.05mV，持续0.16s