You’d better have your room _______. It’s ______.

　 A. clean; a mess　　 B. clean; mess　　 C. cleaned; a mess　　 D. cleaned; mess

We should be ______ (周到的) and helpful to the aged people.

Sending Sandra a letter was ________，because her husband might intercept(截取) it.

A. out of question 　　 B. out of the question

C. in question 　　　　 D. of question

---Why do you look so upset?

---There are so many troublesome problems _____.

A. remaining to be settled 　　　

B. remained settled

C. remaining to settle 　　　　

D. remained to be settled

—Did you know anything about the performance to take place in Shanghai?

　　—_________.

　　A. Not even you told me B. Not if you told me

　　C. Not whether you would tell me D. Not until you told me

At first, the earth’s surface（表面） layer (层) was made up of huge blocks of hard, solid rocks. Then slowly, the rocks broke up into smaller and smaller pieces. Finally stones, pebbles (卵石) and grains of sand were formed. Many sorts of plants and animals lived and died on the surface of the earth. Their remains mixed up with the stones, pebbles and formed soil. The outmost layer of the earth is soil.

There are many ways in which large pieces of rock break into smaller ones. Wind, water. heat and cold help to break up rocks. When winds blow grains of sand against a large rock for a long time, the softer layers of the rock are slowly worn away. These leave holes and cracks (裂缝) in the rock, which become bigger and finally the rock breaks up into smaller pieces.

The moving water of streams and rivers also helps to break up rocks. As the water moves along, it carries with it small pieces of rock. These rub the larger ones. Thus, the larger rocks are worn down to smaller pieces.

The heat of the sun is also helpful to breaking up rocks. When the sun shines, the rocks become very hot. If these rocks are suddenly cooled, they may crack. Ice also plays a part in making soil. Water in the carcks can turn into ice in cold weather. As this happens, it becomes bigger and the cracks become wider, and finally break into smaller pieces.

1. According to the passage, soil____________ .

　 A. forms very slowly

　 B. is a mixture of stones, pebbles and sand

　 C. makes up the layers of the earth

　 D. is becoming smaller and smaller

2. How many factors are mentioned in helping break up rocks?

　 A. Three.　　 B. Four.　　 C. Five.____________ D. More than five.

3. Which of the follwing speeds up（加速） the breaks of rocks most?

　 A. Hot weather.________________________　　 B. Cold water.

　 C. Sharp changes in temperature.　　 D. More dead plants in the cracks.

4. Which of the following is NOT true?

　 A. The remains of many plants and animals formed soil.

　 B. If a large rock never moves, it will never break up.

　 C. Even if a large rock never moves, it will break up.

　 D. Ice in the cracks helps to break up rocks.

5. The best title for this passage should be____________ ?

　 A. Soil From Rocks

　 B. Ways to Break up Rocks

　 C. Soil on the Earth

　 D. Soil, Outmost Layer of the Earth

Marie Curie and her husband Pierre Curie discovered radium and polonium, ____ they won the Noble Prize in Physics.

A. as　　　　　　　 B. where

C. for which　　　　　　 D. on which

All the people ______ at the party were his supporters.

A. present　　 　　　 B. thankful　　 C. interested　　 D. important

Last term our maths teacher set so difficult an examination problem _____ none of us worked out.

　 A. that 　 B. as

　 C. so that 　 D. which

We discussed where to go for a whole morning, but we decided to stay at home_____.

A. at the end　 　　　　　 B. by the end　　 C. in the end　　 　　D. on end