Skipping breakfast can also cause you to overeat. To make matters worse,  ________your body is

in a slow state,   it won't be able to burn the extra calories very efficiently. [ ]

A. unless  

B. though

C. since  

D. before

非洲人口最多的国家是

A   埃及      B   南非      C   尼日利亚     D 阿尔及利亚