支付宝主要提供的服务属于以下哪种( )
A. 比较购物助手
B. 信用认证网站
C. 购物门户
D. 第三方担保服务
【单选题】The unit used to describe your blood pressure number is read as ____________.
A. micron of mercury
B. millimetre partial pressure
C. mercury pressure
D. millimetre(s) of mercury
【单选题】In about 90% cases, the cause of hypertension is unknown. This type of high blood pressure is called _____________.
A. primary hypertension
B. secondary hypertension
C. renal hypertension
D. mask hypertension
【多选题】When taking blood pressure at home, you should always remember to avoid ______ at least 30 minutes before the test.
A. caffeine,
B. cigarettes,
C. exercise
D. food