I am good at playing the piano, but Lucy is even ________ at it.
A．good
B．better
C．best
D．well
答案：B
题目分析:根据语境可知此题的基本含义是我擅长弹钢琴，而Lucy更擅长它。根据字面意思可知有比较含义，应用比较级，而固定短语be good at sth表示擅长做某事，故选B。
点评：解答此类题型首先要知道语句的含义，考查的固定结构的基本用法。然后结合具体语境选择合适答案。
| A pilot cannot fly a plane by sight alone. In many conditions, such as flying at night and landing in dense fog, a pilot must use radar, an alternative way of navigating. Since human eyes are not very good at determining speeds of approaching objects, radar can show a pilot how fast nearby planes are moving. The basic principle of radar is exemplified by what happens when one shouts in a cave. The echo of the sounds against the walls helps a person determine the size of the cave. With radar, however, the waves are radio waves instead of sound waves. Radio waves travel at the speed of light, about 300, 000 kilometers in one second. A radar set sends out a short burst of radio waves: Then it receives the echoes produced when the waves bounce off objects. By determining the time it takes for the echoes to return to the radar set, a trained technician can determine the distance between the radar set and other objects. The word "radar," in fact, gets its name from the term "radio detection and ranging." "Ranging" is the term for detection of the distance between an object and the radar set. Besides being of critical importance to pilots, radar is essential for air traffic control, tracking ships at sea, and for tracking weather systems and storms. |
The phrase "a burst" underlined in Paragraph 1 most probably means ______.
A．an attachment
B．a discharge
C．a stream
D．a ray