The word “hidden” in paragraph 1 is closest in meaning to
A.undrinkable
B.untouched
C.unexploitable
D.undiscovered

Which of the following is closest in meaning to “frigid” in paragraph 1?
A.Extremely cold
B.Easily broken
C.Quite harsh
D.Lukewarm

A ll of the following are true about the 1970 survey of AntarcticaEXCEPT that it ______
A.was conducted by air
B.made use of radio waves
C.could not determine the lake’s exact size
D.was controlled by a satellite

The word “microbes” in paragraph 3 could best be replaced by which of the following?
A.Pieces of dust
B.Tiny bubbles
C.Tiny organisms
D.Rays of light

In making remarks, he _______to understatement.
A.declined
B.intended
C.aligned
D.inclined

After her illness, Lam had to work hard to _______ his classmates.
A.catch sight of
B.keep pace with
C.get in touch with
D.make allowance for

Some kinds of birds are on the _______of extinction.
A.brink
B.tip
C.side
D.edge

_______of popular expressions in our language have interesting backgrounds.
A.A large number
B.The large number
C.A great deal
D.A sum

Please _______your cigarette. I am going to get choked.
A.cut down
B.blow out
C.put aside
D.put out

Since the reform, the country has undergone _______changes.
A.large
B.sizeable
C.substantial
D.favourable