What does the passage mainly discuss?
A.The salinity of ocean water
B.The many forms of ocean life
C.The elements of salt
D.The bodies of water of the world

According to the passage, the ocean generally has more salt in_________.
A.coastal areas
B.rainy areas
C.turbulent areas
D.tropical areas

Jane: Thank you for a lovely evening. Barbara: _________
A.Have a good day
B.Thanks
C.You are welcome
D.Cheer!

What is the main idea of the passage?
A.Advantages of madatory volunteering programs for students
B.An obligatory volunteer program at high school in Maryland
C.Students of 1997’s attitutes towards obligatory volunteering
D.Volunteering at a variety of organizations in Maryland in USA

What does the word “It” in paragraph 4 refer to?
A.doing obligatory volunteer work
B.writing essays on their volunteer work
C.helping out the community
D.completing a mandatory requirement

A.substance
B.dependent
C.chemist
D.insight

A.advertise
B.admiral
C.adventure
D.adverb

The word "dwindling" in the first paragraph is closest in meaning to .
A.diminishing
B.changing
C.increasing
D.limiting

Which of the following can be inferred from the passage?
A.Our present energy sources must be eliminated and replaced with alternative sources.
B.Demands for energy in the future are likely to decrease.
C.The search for alternative energy sources is not over.
D.Alternative sources of energy on this planet are very limited.

The passage suggests that .
A.people use energy without giving great thought to where it's coming from
B.modern society requires a minimum amount of energy to keep it running
C.the search for energy sources is mainly a problem for the future
D.scientists believe we will never have to go without our modern conveniences