在正四面体P-ABC中,点D,E,F分别是AB,BC,CA的中点,则下面四个结论不成立的是( )
A:BC∥平面PDF
B:DF⊥平面PAE
C:平面PDF⊥平面ABC
D:平面PDF⊥平面PAE
温室效应是由于进入大气中的( )为主的气体增加产生的.
读图,回答下面小题。
下列不属于珍爱生命健康权的是 ( )①奋力抢救路遇的伤病者②怕打针吃药,患了感冒久拖不治,结果得了心肌炎③打伤入室抢劫、行凶的人④闯红灯过马路,险些与汽车相撞
根据短文内容,选择正确答案。
Here is a photo. The two girls have big blue eyes and long brown hair. They are both ten years old. They are in the same class. The one in a yellow skirt is Lily. The other one (另一个) an orange skirt is Lucy. Their father (父亲) is Mr. White. He is in a brown coat. Their mom is Mrs. White. She is in a black dress. Who is that boy in a blue cap? He is Lucy and Lily's brother(哥哥), Bob. He is a high school student. Look! Lucy and Lily are in a green car.