A.mastered the art of making primitive tools
B.showed that certain tasks were impossible without tools
C.found it unpleasant to skin animals with his teeth
D.showed that modern man could survive in primitive conditions
[问答题]A few minutes later the doctor came out of his room for the third time.
[问答题]A few minutes later the doctor came out of his room for the third time.
[单选题]My father was ___ a book when I came into his study.A.seeingB.lookingC.read
[单选题]When he the door, he found his keys were nowhere.A. would open B. opened C. had opened D. was to open
[单选题]His father is _______ than his mother.A.older two yearsB.two years olderC.e
[单选题]His mother ____________ alone since his father died.A.lived B.lives C.has l
[单选题]H.isremarksleftme_______abouthisrealpurpose.A)wonderedB)wonderC)towonderD)wondering
[单选题]His mother______alone since his father died.A.livedB.livesC.has livedD.is l
[单选题]Jack is so______to his appearance that he never has his clothes pressed.A.a
[单选题]3. When I came into the room,he pretended ________ his homework.A. to doB. be doingC. doingD. to be doing