如图所示的实验装置能用于探究光合作用( )
①需要水;②需要二氧化碳;
③需要光;④需要叶绿体;
⑤释放氧气;⑥产生淀粉.
A:⑤⑥
B:①⑤
C:②③④
D:③⑥
下列现象中属于生物影响环境的是( )
读问句,选择对应的答句。
____①What's the weather like today? A. No, you can't.
____②Where are my books? B. Yes, it is.
____③What time is it? C. It's rainy.
____④Can I wear my new skirt? D. It's twelve o'clock.
____⑤Is it cool? E. They're on the bed.
某物体沿直线运动,其v﹣t图象如图所示:
0~4秒内物体的加速度是____ m/s2;
4~6s内物体的加速度是____ m/s2;
0~8s内物体的位移是____ m.