A:were using
B:are used
C:were used
D:are using
参考词汇:Saturday, Sunday, morning, afternoon, evening…
do homework, watch TV, go hiking, play sports, go camping, ride a bike, take pictures, clean the room, wash the clothes …
Monday, June 6th
I was busy last weekend. On Saturday, I
读我国分区略图(如图所示),下列叙述正确的是
“歼20”是我国自主研制的新一代隐身重型歼击机,具有卓越的机动性能,当它在空中加速向下俯冲的过程中,动能____ ,重力势能____ .(选填“增大”、“不变”或“减小”)