从右栏中找出左栏各句的应答语。
①What does he look like?____ A. It's yellow.
②Is his bike new?____ B. Yes, they are.
③Whose book is this?____ C. He has gray hair.
④Are these your apples?____ D. Sorry, I don't know.
⑤What color is your coat?____ E. It's mine.
烧砖一般经过用黏土制砖坯、砖坯被晾干、烧制砖坯和搬运制成的砖的过程。
质量为50 kg的乘客乘坐电梯从一层到四层，电梯自一层启动向上做匀加速运动，加速度的大小是1 m/s2，则电梯启动时地板对乘客的支持力为（g取10 m/s2）（ ）
