---Do you know ? ---Yes. He lives in Japan. A. where did he live B. where he lived C. where he lives D. where does he live
设a=(4,3),a在b上的投影为,b在x轴上的投影为2,且|b|≤14,则b为 A.(2,14) B.(2, －) C.( －2, ) D.(2,8)
阅读下列材料，结合图文资料，回答问题。 材料一 农作物熟制：指一定时间内，作物正常生长收获的次数。一年内，作物正常生长，只收获一次的，叫
如图为几种生物示意图，有关叙述错误的是（ ） A．①②可用来制面包和酒 B．③由蛋白质外壳和内部遗传物质构成 C．对污水净化
. I met John the other day .Guess what ? What ? He changed so much that I didn’t___ him____ at first. A. put, out B.take out C make out D.turn ,out
1．说明下列图中所蕴含的物理知识或解释其中现象（1）图1中的图文说明正在发声的物体在 ；（2）图2中的实验现
All the preparations, we're ready to start. A. made B. being made C. having made D. have been made
