New research（研究) about how much time people spend on their smartphones(智能手机) per day.

小题1:People cannot use the smartphones to _________________

A．read e-books

B．send text messages

C．take photos

D．play football小题2:Smartphone owner spends most of the time _______________ every day.

A．surfing on the internet

B．listening to music

C．watching videos

D．making phone calls小题3:Making phone calls with the smartphone was only the _____ most popular use.

A．first

B．sixth

C．twelfth

D．fifth

经皮穿刺主动脉瓣球囊成形术的适应证（）

A.跨瓣压差＞50mmHg，排血量正常，无轻度以上的主动脉瓣关闭不全

B.有明显动脉粥样硬化的临床表现而不宜行主动脉瓣置换术者

C.先天性单纯动脉粥样硬化，体重≥1600g

D.老年钙化性动脉粥样硬化不能耐受手术者

E.伴中度以上的主动脉瓣反流