They have decided to ____ at the Doubles Championship.

I played a doubles tennis match ______ with a 90-year-old.

Moore's law means _____. A: The power of integrated transistors on a chip doubles every year, and so does its computing power. B: The power of integrated transistors on a chip doubles every two years, and so does its computing power. C: The power of integrated transistors on a chip doubles every 18 months, and so does its computing power; D: The power of integrated transistors on a chip doubles every six months, and so does its computing power.

We are all excited at the news_____our annual sales have more than doubles. A: that B: it C: which D: where

When the size of a tax is doubled, the deadweight loss from the tax ( ) A: increases by the size of the tax. B: doubles. C: remains constant. D: increases by a factor of four.

The amount of information ________ to anyone in the world today via modern technologicalmeans doubles in density and quantity every three years.

The author’s partner in a doubles tennis match is a f_______________ example of a person who has never stopped learning.

Zheng Jie and Yan Zi have won two grand slam______ titles. A: double B: doubles C: single D: singles

在C 语言中，下面选项（ ）是合法的变量名。 A: Min B: Doubles C: First.name D: float E: 3rd_row

The longest back boundary line is also called________. A: The side line B: The short service line C: The lone service singles. D: The doubles’ line