下列仪器中，能直接在酒精灯火焰上加热的是（    ）

①试管 ②烧杯 ③量筒 ④蒸发皿 ⑤石棉网．

如图是人和动物细胞结构模式图，根据图回答问题：

图中①是____ ，功能是____ ．图中③是____．功能是____ ．

完形填空
    Is it difficult for you to get up in the morning? Do you sometimes oversleep? Do you often1late? Yes? Then Hiroyuki Sugiyama of Japan invented a 2bed for you. His bed will wake you up! Here is3it works.
    There is an alarm clock and a recorder（录音机） in the bed. When the clock 4a sound, you’ll have a few minutes to wake up. Then the recorder plays light music with a little girls’5 voice. She says quietly, “Wake up, my dear.” A few 6 later, a second recording plays. It can be unpleasant sounds, “Wake up,7you’ll be late!”
    If you don’t get up after the8recording, you’ll be sorry. There is a mechanical (机械的) “9” in the bed. It can kick（踢） you in the head. Then the bed10for a few more minutes. What? You’re 11lying in bed! Slowly the top of the bed goes 12. The end of the bed goes lower and lower. 13 the bed is straight. You slide off(滑下)the bed and fall onto the14 . You are 15the bed and awake.

下面是日常生活中常见的五种生物。请结合所学的生物学知识，回答下列问题：