What does the passage mainly discuss?
A.How birds find and store food
B.How birds maintain body heat in the winter
C.Why birds need to establish territory
D.Why some species of birds nest together

Ptarmigan keep warm in the winter by _______ .
A.huddling together on the ground with other birds
B.building nests in trees
C.burrowing into dense patches of vegetation
D.digging tunnels into the snow

The author mentions “ kinglets” as an example of birds that _______ .
A.protect themselves by nesting in holes
B.nest with other species of birds
C.nest together for warmth
D.usually feed and nest in pairs

Which of the following statements about lesser and common kestrels is true?
A.Lesser kestrel and common kestrel have similar diets.
B.The lesser kestrel feeds sociably but the common kestrel does not.
C.The common kestrel nests in large flocks than does the lesser kestrel.
D.The common kestrel nests in trees; the lesser kestrel nests on the ground.

Tom: “Lilly, may I use your pen?” - Lilly: “_________”
A.Feel free
B.Forget it
C.Nothing at all
D.No problem

____________ appears considerably larger at the horizon than it does overhead is merely an optical illusion.
A.The Moon
B.The Moon which
C.When the Moon
D.That the Moon

____________ you have the money in your account, you can withdraw up to $100 a day.
A.Unless
B.Although
C.Provided that
D.As soon as

I couldn't believe that they were brothers. They were as different as _________
A.Mars from Jupiter
B.milk from honey
C.chalk from cheese
D.dogs and cats

The reason he wants to take a leaving of absence is that he needs a complete rest.
A.The
B.leaving
C.that he
D.complete

It is the writing English that causes difficulties to foreigners.
A.the writing
B.that
C.difficulties
D.foreigners