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She found ___ hard to finish the work by herself.

A. that B. it’s C. it D. this

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A tree is a plant with a tall woody trunk. Like all plants, trees need air, water and sunlight to live and grow.

A tree has a long, woody trunk covered in bark (树皮). The trunk supports the branches, lifting them high above the ground. Bark is dead and protects the living trunk inside. The trunk grows thicker and taller each year.

Trees have many branches. Tree branches spread out in all directions towards sunlight. More and more branches grow each year.

Leaves grow on the branches. The leaves cover the tree in a canopy of green. Leaves use the sun’s energy to make food for the whole tree.

The tree has roots under the ground. Roots absorb water and nutrients from the soil. Trees need water to live and grow. The roots also hold the tree firm when the wind blows.

In cold climates most broadleaf trees lose their leaves in winter. The short cold days cause the leaves fall. Trees that lose their leaves in winter are called deciduous trees.

In spring, as the weather warms up, the tree buds and new leaves grow. The tree may also flower. In summer, the tree grows. A green covering of leaves provides food for the whole tree. In autumn, as the weather begins to cool and the days grow shorter, the food moves from the leaves to the trunk and roots. Leaves lose their green colour and become dry. When the leaves are dead, they fall from the tree. During winter a deciduous tree stops growing. The tree is still alive. It is waiting for warm temperatures before it starts to grow again.

Many animals live in trees. Trees provide food and shelter for monkeys, squirrels, birds and insects.

Most monkeys find food and shelter in trees. They can also escape from land-based predators to their homes above the ground. Monkeys are well-adapted to life in the trees. Their tails help them to climb and jump from branch to branch. Many small mammals live in trees. Trees provide shelter from wind, rain and other animal.

Many birds live their lives in trees. They build their nests in the branches or hollows of trees. Trees provide fruit, nectar and seeds for birds to eat.

Millions of insects live in trees. Many types of beetles, ants and butterflies depend on trees for food and shelter.

1.What’s the use of the roots of a tree?

① To protect the living trunk. ②To get nutrients. ③ To absorb water.

④To cover the tree in a canopy of green. ⑤ to hold the tree firm.

A. ①②③ B. ①④⑤ C. ②③⑤ D. ③④⑤

2.Why the leaves fall from the tree in autumn?

A. Because they can grow again after winter.

B. Because they are short of food, and then die.

C. Because the leaves lose their green colour.

D. Because birds use them to build their nests.

3.The last few paragraphs tell us that _________________________.

A. many animals live on trees B. there are animals in trees

C. trees provide shelter for man D. trees are still alive in winter

4.Which of the following statements is true?

A. Trees like to grow towards sunlight. B. Branches hold the tree when it’s windy.

C. Trees leaves can make food by themselves. D. Trees are of little help to animals.

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