[填空题]The attitudes of classes have also made inroads into lexical meaning in the case of elevation or ______.

[单项选择]Various efforts have been made over the centuries to predict earthquakes, including observing lights in the sky and ______ animal behavior.
A. absurd
B. abnormal
C. exotic
D. erroneous

[简答题]Industrial psychologists have also studied the effects of fatigue on workers to de-termine the length of working time that yields the greatest productivity.

[填空题]Nowadays, scientists still have not made huge progress on the research of earthquake because they have not fully understood what cause earthquakes.

[单项选择]

In which countries have children made the same efforts as Tiensuu has done.
A. Germany, France and Japan
B. Japan, France and US
C. US, Germany and Britain
D. US, Japan and Germany

[单项选择]It is reported（　）great changes have been made.
A. which
B. that
C. while
D. what

[单项选择]Today, household chores have been made much easier by electrical （　）
A. facilities
B. equipment
C. appliances
D. utilities

[单项选择]

Valentine boxes have been made by students in classrooms for many years. They eon be done in class or as a home project for the whole family to enjoy. You must first choose a box. Any box will do and you will need an adult to cut a slit in the top of the box to insert valentine cards.
You can use paper to cover your box or paint the box. Choose a valentine color that you like. If you decide to paint your box, you will need to let it dry for several hours before decorating. After you have covered or painted the box, the fun begins!
Many children like to draw their completed valentine box on paper before they begin decorating it. It gives you a plan for your box. When your plan is complete, start the decorating. Use any items you have at home to decorate the box or ask a parent to take you to a store to choose items to decorate your box. Make sure it pleases you. It is your box to use on Valentine’s Day at school. Have a great time!

What must you do first
A. Palm the box.
B. Choose a box.
C. Cut a slit in the top;

[单项选择]Attempts have been made for nearly three decades to increase the amount of precipitation from clouds by seeding them with salt or silver iodide.（　）
A. Devices
B. Hypotheses
C. Efforts
D. Suggestions

[单项选择]Although many modifications have been made in it, the game known in the United States as football can be traced directly to the English game of rugby.
A. rules
B. changes
C. demands
D. leagues

[填空题]They must have also enjoyed themselves because they gave us the word "laughter".

[简答题]S4. We have also expanded the treatment of technical articles -- recognizing the potential contribution of article writing to the career of the writer and the value of the article to science and technology.