I.单选填空（共20小题，每题1分，计20分）
1.Animals are obviously ______ lower form of life than ______ human beings.
A.a; the B.不填；不填 C.a; 不填 D.the; the
2.In summer I often rub sun cream on my face, which ______ a lot of things to help me not to get sunburnt.
A.selects B.contains C.admits D.includes
3.The naughty boy was sitting at the desk, ______ hard when the teacher came into the classroom.
A.pretended to study B.pretending to be studying
C.pretending to study D.pretended to be studying
考点 : 考查非谓语动词
4.It must have taken a long time to ______ all the facts of these old books.
A.take apart B.watch over C.break up D.dig out
