Plants don’t have legs to run or arms to throw a ball, but that doesn’t  21  that plants can’t 22at all． If you watch closely, you will see 23 plants bend their stems and flowers toward the sunlight every day． 24  are plants able to move   25 they don’t have bodies like animals do?

       Plants cells  26  chemicals called auxins（植物生长素） to   27  them to move． To find out how chemicals   28,  think of a plant outside in a garden． Because the sun  rise in the east in the morning, the   29 side of the plant stem is in the light． But the west side of the stem is in the _30 ． So the cells in the shaded side of the stem   31 to make auxins, which make that side of the stem grow  32  while the side of the stem   33  the sun grows much slower．  When the shaded side grows faster, it makes the whole stem  34  toward the sunlight, and  35  leaves and flowers on the stem face the 36  too． When the sun moves to the west in the afternoon, the   37  thing happens and the stem bends toward the light again．

       38   is a reason why the plant produces chemicals that make stems 39  the sun．  Leaves  40 sunlight to make food for the plant． So it is important for stem to get as much light as they can．

21．A． tell                   B． promise           C． show               D． mean

22．A． grow                B． go               C． move               D． stand

23．A． most                 B． few              C． tall                 D． short

24．A． why                 B． How              C． Where              D． When

25．A． because              B． although           C． if                  D． as soon as

26．A． make                B． accept            C． keep               D． send

27．A． push                B． bring             C． help                D． stop

28．A． form                B． work             C． flow               D． look at

29．A． west                B． bright            C． opposite            D east

30．A． shade                B． light              C． dark               D． garden

31．A． stop                 B． begin           C． continue             D． help

32．A． fast                 B． slowly            C． up                 D． badly

33．A． near                 B． toward           C． against             D． in

34．A． bend                B． fall               C． turn                D． walk

35．A． some              B． all                 C． few                D． no

36．A． stem               B． west              C． ground             D． sun

37．A． common           B． strange            C． same               D． different

38．A． This                B． That             C． It                 D． There

39．A． follow             B． circle             C． catch              D． pull

40．A． receive             B． have             C． use                D． reduce

Sea turtles are found in all warm waters throughout the world. Sea turtles are the___36____ of the turtles. The largest kind of sea turtle can grow as long as eight feet and ___37___ 1,500 pounds. Even the smallest kind, Kemp’s-Ridley, can ___38___ to 28 inches long and weigh almost 100 pounds. Many other turtles are small enough to___39___ in your hand. It is difficult to find population numbers for sea turtles because they do not___40____ shore once they hatch and reach the ocean, which makes it hard to ___41___ them. Sea turtles___42___ in the water because they are safer there. They cannot___43___ their heads and feet into their shells like other turtles can. Sea turtles cannot hide inside their shells __44___ other animals that want to eat them. They need to move quickly to stay safe.

When the weather ___45___ warm, sea turtles leave the ocean to___46___ their eggs on the beach. This is the only time they will ever leave the water. Most___47____ turtles spend part of the time in water___48___ part of the time on land. It is easy to understand___49____ sea turtles stay in the water. Their___50___ to swim is greater than their ability to walk. Their heavy bodies and unusual feet make it hard for them to ___51___ on land. They are better___52___ for life in the water. They are well suited for life in the sea because of__53___ their bodies are made.

The way their feet are made helps sea turtles swim very quickly. Their feet look like long __54___. When they swim, they flap their feet like a bird flaps its wings. This ___55___ way of swimming benefits sea turtles. It allows them to escape from their enemies.

1.	A．dwarfs B．giants C．mammals D．ancestors

 

2.	A．measure B．weigh C．sell D．sound

 

3.	A．grow up B．bring up C．take up D．go up

 

4.	A．suit B．fit C．match D．seize

 

5.	A．go to B．turn to C．back to D．return to

 

6.	A．keep up with B．keep track of C．keep in touch with D．keep to

 

7.	A．swim B．hide C．sleep D．stay

 

8.	A．push B．draw C．drag D．pull

 

9.	A．away B．from C．for D．to

 

10.	A．becomes B．turns C．changes D．leads

 

11.	A．lay B．lie C．laid D．lain

 

12.	A．the other B．another C．other D．others’

 

13.	A．but B．and C．or D．so

 

14.	A．when B．where C．why D．as

 

15.	A．technique B．talent C．ability D．opportunity

 

16.	A．walk B．travel C．wander D．play

 

17.	A．adopted B．adapted C．adequate D．admitted

 

18.	A．the way B．the manner C．the method D．the shape

 

19.	A．paddles B．sticks C．wings D．tails

 

20.	A．abnormal B．unusual C．ordinary D．unbelievable

 

Sea turtles are found in all warm waters throughout the world. Sea turtles are the___36____ of the turtles. The largest kind of sea turtle can grow as long as eight feet and ___37___ 1,500 pounds. Even the smallest kind, Kemp’s-Ridley, can ___38___ to 28 inches long and weigh almost 100 pounds. Many other turtles are small enough to___39___ in your hand. It is difficult to find population numbers for sea turtles because they do not___40____ shore once they hatch and reach the ocean, which makes it hard to ___41___ them. Sea turtles___42___ in the water because they are safer there. They cannot___43___ their heads and feet into their shells like other turtles can. Sea turtles cannot hide inside their shells __44___ other animals that want to eat them. They need to move quickly to stay safe.

When the weather ___45___ warm, sea turtles leave the ocean to___46___ their eggs on the beach. This is the only time they will ever leave the water. Most___47____ turtles spend part of the time in water___48___ part of the time on land. It is easy to understand___49____ sea turtles stay in the water. Their___50___ to swim is greater than their ability to walk. Their heavy bodies and unusual feet make it hard for them to ___51___ on land. They are better___52___ for life in the water. They are well suited for life in the sea because of__53___ their bodies are made.

The way their feet are made helps sea turtles swim very quickly. Their feet look like long __54___. When they swim, they flap their feet like a bird flaps its wings. This ___55___ way of swimming benefits sea turtles. It allows them to escape from their enemies.

36.	A.	dwarfs	B.	giants	C.mammals 　 D. ancestors
37.	A.	measure	B.	weigh	C.	sell	D.	sound
38.	A.	grow up	B.	bring up	C.	take up	D.	go up
39.	A.	suit	B.	fit	C.	match	D.	seize
40.	A.	go to	B.	turn to	C.	back to	D.	return to
41.	A.	keep up with	B.	keep trackof	C. keep in touch with D. keep to
42.	A.	swim	B.	hide	C.	sleep	D.	stay
43.	A.	push	B.	draw	C.	drag	D.	pull
44.	A.	away	B.	from	C.	for	D.	to
45.	A.	becomes	B.	turns	C.	changes	D.	leads
46.	A.	lay	B.	lie	C.	laid	D.	lain
47.	A.	the other	B.	another	C.	other	D.	others’
48.	A.	but	B.	and	C.	or	D.	so
49.	A.	when	B.	where	C.	why	D.	as
50.	A.	technique	B.	talent	C.	ability	D.	opportunity
51.	A.	walk	B.	travel	C.	wander	D.	play
52.	A.	adopted	B.	adapted	C.	adequate	D.	admitted
53.	A.	the way	B.	the manner	C.	the method	D.	the shape
54.	A.	paddles	B.	sticks	C.	wings	D.	tails
55.	A.	abnormal	B.	unusual	C.	ordinary	D.	unbelievable