中一Science

1 When the fuel burns in a steam engine, steam is produced to drive the__, which drives the generator to generate electricity
2 When someone speaks,he/she gives out__energy
3 When a lamp is switched on,__energy is changed to light energy
4 We must take safety __s to avoid accidents during the transportation of fuels
5 We may get an__if we touch an electric socket with wet hands
6 To boil a beaker of water,a piece of __should be placed on a tripod to support the beaker
7 The particles in a solid cannot move freely.Each particle only __s about a fixed position
8 The__is a device that changes kinetic energy to electrical energy
9 The__can control the movement of substances into and out of a cell
10 Some plants become endangered because they are__for gardening or medicinal purposes
11Sea water can be changed to drinking water by__in a desalination plant
12Polar bears have a thick layer of fur on their skin.They are classified as__
13Nuclear power stations produce __waste which is hazardous to living things
14Many plants __by producing seeds
15Mammals produce milk from their__to feed their young
16Lizards are classified as__ Their body __changes with the environment
17Living things are classified according to their___ in body structures
18Liquids have fixed__ but no fixed__
19In living things,new cells are formed through__s
20Ferns,pines and mosses belong to the group of__ plants
21Chemicals in the laboratory may be corrosive,flammable,harmful or toxic.We should pay attention to the__s on their containers
22 Building large dams for a__power station will destroy natural habitats
23A windmill uses the __energy of wind to do work
24A spring gains__ energy when it is stretched
25A __shows the feeding relationship between living things
26__means turning used material into new products
27__are formed from remains of plants and animals that have been buried underground for millions of years.
28__and ozone can be added to kill micro-organisms