听说
1.This was the largest extinction event of all time.
2. Conditions must be right for life to exist.（86）
3.Some scientists believe that there were several causes.
4.Life exists in a variety of conditions.(89)
5.Most of the Earth's surface is covered by water.(73)
6.To become extinct means to die out completely.(86)
7.We need to protect the environment that supports to us.（82）
8.As the polar icecaps melt, ocean levels will rise.
9.The entire ecosystem that we depend on is changing.
10.Mammals include some of the most intelligent animals on Earth，such as elephants and human beings.（83）
11.Unlike animals, plants get the energy that they need from the sun.(82)
12.Mosquitoes cause the deaths of more humans than any other animal.(80)
13.Can you guess what it is?(80)
14.It's the first year anniversary of their first date.(80)
15.It’s a very special day for both of us.(80)
16.Let’s go in and look at the menu.（92）
17.She likes the food choices, especially the fish.（81）
18.Without water, farmers cannot grow food. (88)
19.Let's see if we can get a table. (93)
20.I went to your website but it didn't help. (89)
21.Earth is where we all live. (85)
22.Do you know what day it is today? (89)
23.It's one of those new driverless cars. (89)
24.I sure hope the food is good. (83)
25.He is worried about spending so much money. (90)
26.He remembered that today is their anniversary. (85)
27.It is one of those new driveerless cars. (80)
28.Birds are covered by feathers and are warm-bloonded. (85)
29.It's difficult to predict what's going to happen.(83)
30.Human beings cannot live in a poisoned environment.（89）
31.At high altitudes, the air is too thin to breathe.(81)
32.We started dating a year ago today!(87)
33.The meanu looks great, especially the fish.(93)
34.Bus No. 60 was supposed to come at 8:30.
35.These foods are deep-fried and greasy.
36.They like to watch music videos.
37.I'll be there in 10 minutes.
38.Areas of some countries will soon be under water. (83)
39.Scales and rulers are used to measure weight and length. (80)
40.Please call back during business hours.（82）
41.
42.He need to eat fewer sweets and exercise more. (69)
45.You may also go to our website for help. (89)
46.96% of all of life in the oceans die out.（88）
看说：
1.As the polar icecaps melt, ocean levels will rise.(74)
2.These instruments are used to observe very large and very small objects.(76)
3.Most insects such as ants and bees have a small, 3-part body with 3 pairs of legs.(75)
4.Mammals are covered by hair or fur, have a back and are warm-blooded.(75)
5. People will be forced to relocate from flooded areas. (66)
6.These appliances are used in the kitchens of almost every home.
7.Some forms of live in a watery environment, like the oceans.(75)
8.The causes of this extinction event are still unknown.
9.This event happened over a period of several million years.
10.Most insects such as ants and bees have a small, 3-part body with 3 pairs of legs.
11.This planet Earth is our only home and we need to protect it.
12.These appliances are used in the kitchens of almost every home.
13.It took 15 minutes for them to have breakfast.
14.Eating too many sweets isn't good for your teeth.
15.She wants to the rest of the day to go as usual.
16.As the polar icecaps melt, ocean levels will rise. (71)
17.Some scientists believe that there were several causes. (77)
18.
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