Structure结构

4  ---- or the chance that they ______ an unexpected discovery that…(11. 2-3)

a．would make

b．can make

c．may make

d．might have made

5  It can take as long as eight days getting rope ladders rigged up and ______ before …(11. 9-10)

a．to establish bases supplied

b．supplying bases established

c．establishing supply bases

d．bases established and supplied

6  After ______ the narrow gap, they climbed down the steep sides of the cave. (11. 18-19)

a．they were entering

b．entering

c．entered

d．they will enter

7  ---- let ______ the current to the other side . (11. 22-23)

a．them be carried with

b．their being carried by

c．themselves carry

d．themselves be carried by

8  No other sound could be heard ______ made by water…(11. 30-31)

a．except it was

b．than that

c．that was

d．but this was

Vocabulary词汇

9  It can take ______ eight days to rig up… (1. 9)

a．around

b．more than

c．up to

d．at least

10  ---- has tunnelled a course through a ______ in the rocks. (11. 13-14)

a．fault

b．gap

c．cleft

d．fissure

11  They had to ______ along this …(11. 19-20)

a．sidle nervously

b．file sideways

c．walk sharply

d．move cauriously

12  To protect themselves from the ______ water, they wore special rubber suits. (1. 23)

a．frozen

b．freezing

c．chilly

d．iced

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