( 1 )汽车行驶时间为40分钟;
( 2 )AB表示汽车匀速行驶;
( 3 )在第30分钟时,汽车的速度是90千米/时;
( 4 )第40分钟时,汽车停下来了.
设定义在R上的偶函数fx满足fx+2=fx,f'x是fx的导函数,当x∈0,1时,0≤fx≤1;当x∈0,2且x≠1时,xx-1f'x<0.则方程fx=lgx根的个数为( )
冬去春来,公园中繁花似锦.人们能在各个方向看见公园里盛开的花朵,是因为光在物体的表面发生了____ ;我们能够看到红色的花朵,是因为红花反射了太阳光中的____ 色光;公园中到处弥漫着花儿的芬芳,说明花香分子在做____ .
阅读下列短文, 从每题所给的四个选项(A、B、C、D)中选出最佳选项。
Film Reviews(影评)
James
I really enjoyed this movie.It's a fun movie for the whole family.I had really good laughs and enjoyed being there
Sam
I would recommend this movie to everyone.In fact, when you go to see it together with your family or friends, I think this movie has something you will really enjoy!
John
I have seen some movies of this kind, but this one is the best.It is so well made.Some of the scenes are so beautiful.
Mary
I went to see this movie with my nine-year-old daughter this Tuesday.I really didn't know too much about it before.My daughter and I were surprised at how funny it was.Just couldn't help laughing.I would recommend this movie to the whole family .