Can we make animals work for us?Some scientists think that one day we can teach animals to do a lot of things for people.They say that in a film or on TV you may see elephants， monkeys，dogs or some other animals doing a lot of things.If you watch carefully，you may find those animals are always given a little food to eat after they have done something.Scientists say that people can teach many different animals to do some easy work if they know they will get something to eat.
We all know elephants can carry large logs(圆木) and dogs can look after houses.And we can even teach animals to work in factories.In America，for example，people use apes(猿) to help make cars.Scientists think that those big monkeys may，one day，drive trains.Now people are trying to let them do something just like man.
阅读短文。选择正确答案。
(1)
People can teach animals to do some easy work if __________.
A.the animals have enough food to eat
B.the animals learn they'll get something to eat
C.the animals are as clever as man
D.the animals are big enough
[ ]
(2)
At present people are letting elephants do some __________ work.
A.difficult B.heavy C.light D.busy
[ ]
(3)
We can use dogs to __________.
A.drive trains B.help make cars
C.keep the houses safe D.carry logs
[ ]
(4)
Scientists are trying to let big monkeys __________.
Plant scientists consider them as fruit．Most other people think of them as vegetables．Whatever you call tomatoes, there are many different kinds of this popular and healthy food．
There are two groups of the plants．Small tomato plants grow to about one meter．They can be planted rather close together．Some short kinds do not require special care and are often gotten crop by machines．Large tomato plants can grow over two meters tall．They also produce larger fruits．
People who grow only a few plants can place wire cages around each one．The cage can be made of wire fence material．The cage helps the plant grow taller and produce a better crop．
Tomatoes often need extra calcium(Ca), or the fruits may be ruined．Add lime to the soil can solve this problem．Dry lands may also ruin the fruits．Tomatoes need water regularly．The soil should never dry out completely．Dried grass or leaves placed around the plant can help hold water in the soil and stop the growth of unwanted plants．
Tomatoes are native to South America．The tomato is a member of the potato family．The leaves of the plant are poisonous, like the leaves of its relatives．Before the 18th century, people grew tomatoes only as pretty plants．They called the bright red fruit a “love apple”, but would not eat it．
(1)
Which of the following is right about the small tomato plants?
[ ]
A．
They can grow to about 2 meters．
B．
They can’t be planted close together．
C．
Some of them don’t require special care．
(2)
People place wire cages around the plant in order to _________．
[ ]
A．
protect the plant from being taken by others．
B．
help the plant grow taller and produce a better crop
C．
keep the plant from being eaten by animals
(3)
The underlined word “ruin” probably means “_________”．
[ ]
A．
grow
B．
destroy
C．
stop
(4)
People often give tomatoes extra calcium by _________．
[ ]
A．
adding lime to the soil
B．
watering the plant regularly
C．
putting dried grass around the plant
(5)
What can we learn from the passage?
[ ]
A．
Tomatoes are native to North America．
B．
The leaves of the plant can also be eaten．
C．
Americans began to eat tomatoes from the 18th century．
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