A:使用纤维素和淀粉为原料制成的微生物降解塑料,可治理“白色污染”
B:发电厂的煤在燃烧时加入适量生石灰,有利于环境保护
C:泄露在美国墨西哥湾海洋中的大量原油能被海洋生物迅速分解,不会导致生态灾难
D:大力开发风能、太阳能、核能,有利于实现“低碳经济”,减少温室气体的排放
如图所示“进化树”可以直观的表示生物之间的亲缘关系和进化历程.从该进化树可以推测( )
听短文,写出所缺部分。
Hi! My name is Linda! I'm a middle school student. It was____lastSunday.After breakfast, my grandparents went for a walk in the park with their dog.They liked the____air there.My father____with his friend.My mother had to____.What about my brother? He read a book about____in his room.I practiced the piano in the living room.
38+45=
10﹣1.05=
45× 49 =
67 ÷80%=
3﹣2÷5=
7π=
14 + 15 =
要建设一个团结的集体,需要我们( )
①张扬个性,以我为主 ②融入集体,奉献集体
③各尽所能,发挥所长 ④多多合作,避免竞争