关于撒哈拉以南非洲的人口粮食环境问题,你认为需首要解决的是( ) A.粮食供应问题 B.控制人口的过快增长 C.肉类缺乏问题 D.土地沙漠化问题 答案:B ( ) 10. [2013 •梅州]—Mr. Li to Mary carefully when I entered the classroom this morning.—He is very patient he is young. A. talking ; but B. was talking ; though C. talks ; though D. talked ; however