READ TEXT I AND ANSWER QUESTIONS 31 TO 45:
Reduce in "We can reduce that number" (l.22) can be replaced by:
READ TEXT II AND ANSWER QUESTIONS 46 TO 53:
sensitive in "the most environmentally sensitive issues" means:
READ TEXT III AND ANSWER QUESTIONS 54 TO 57:
The underlined expression in "give off oxygen" (l.2) can be replaced by:
READ TEXT IV AND ANSWER QUESTIONS 58 TO 62:
The opposite of "little" in "little fossil energy is required" (l.1) is:
READ TEXT IV AND ANSWER QUESTIONS 58 TO 62:
In addition (l.4) can be replaced by:
READ TEXT V AND ANSWER QUESTIONS 63 TO 70:
damage in "can seriously damage" (ll.1-2) signifies:
READ TEXT V AND ANSWER QUESTIONS 63 TO 70:
The opposite of "clean" in "is very clean" (l.9) is:
READ TEXT V AND ANSWER QUESTIONS 63 TO 70:
The opposite of "bottom" in "the reservoir's bottom" (l.27) is:
READ TEXT I AND ANSWER QUESTIONS 21 TO 29:
When samples are selected "randomly" (l.1), they are picked:
READ TEXT I AND ANSWER QUESTIONS 21 TO 29:
The underlined word in "threatening objects" (l. 7) suggests these objects are
