On the River Thames there are a number of boat races every year and these have become very popular with the public. Perhaps the best–known of these races is the University Boat Race. This takes place just before Easter every year and is a competition between teams from the Universities of Oxford and Cambridge. They row from Putney to Mertlake, a distance of about four and a quarter miles. This race has been taking place almost every year since 1829.

小题1: The best – known of these races is __________.

A．the Boat Race of the University of Oxford.

B．the Boat Race of the University of Cambridge

C．the Boat Race of the Olympic Games

D．the University Boat Race小题2: Generally, the Boat Race takes place _________.

A．once a year

B．twice a year

C．every three years

D．every other year小题3: The words “Putney” and “Mertlake” are _________.

A．names of places

B．names of teams

C．names of boat races

D．names of universities

基本水位断面是水文站为经常（）而设置的断面。一般设在测验河段的中央或具有断面控制地点的上游附近，大致垂直于流向。

A、测流

B、观测水位

C、观测比降

D、施测大断面