—What’s the best way to reach you if I have a question during the day?

—I'm glad you ________. It’s best if you send me an email.

A．ask

B．had asked

C．asked

D．were asking

夏天，被蚊子叮咬了，蚊子的分泌的酸性物质进入肌肉，出现红肿、瘙痒等症状，下列物质能消肿、止痒的是（　　）

A．食醋

B．食盐水

C．肥皂水

D．酸奶