The main idea of the passage is that in America's frontier days _________.
A.people combined work with creation
B.people cleared land by rolling logs
C.a logrolling involved the community
D.it was necessary for early settlers to clear the land

According to the passage, what did people have to do first to settle an area?
A.Invite neighbors over
B.Develop recreation ideas
C.Build farms
D.Get rid of the trees

Who go to a logrolling?
A.children
B.women
C.families
D.men

Don't tell anybody what I said. You _________ keep it a secret.
A.must
B.might
C.may
D.could

As I was walking along the street, I saw _________ $10 note on _________ pavement.
A.a/the
B.the/a
C.a/a
D.the/the

Jim: "This dictionary is for you. I hope you'll find it useful".
Mary: "_________".
A.Yes, please
B.No problem
C.Thanks. It's very kind of you
D.Thanks. I'll do it

The author of the passage is probably an expert in the field of______.
A.economics
B.physics
C.meteorology
D.transportation

The author organizes the discussion of the different types of fog according to ______.
A.their relative density
B.their relative frequency
C.the types of problems they cause
D.their geographic locations

Which is NOT true of the frontal fog?
A.It forms when two fronts of different temperatures meet.
B.The air is soaked.
C.It is quite common.
D.The warm front has rain falling into the colder front.

It can be inferred from the passage that the Labrador Current is______.
A.warm
B.cold
C.weak
D.polluted