The air that surrounds our planet is both odourless , colourless, and invisible .
A.The air
B.our planet
C.both odourless
D.invisible

According to the passage, animal young are most defenseless when _________ .
A.their parents are away searching for food
B.their parents have many young to feed
C.they are only a few days old
D.they first become independent

The word "shielded" in line 19 is closest in meaning to __________ .
A.raised
B.protected
C.hatched
D.valued

The word "edge" in line 15 is closest in meaning to _____________ .
A.opportunity
B.advantage
C.purpose
D.rest

The word "provisioning" in line 11 is closest in meaning to __________ .
A.supplying
B.preparing
C.building
D.expanding

What can be inferred from the passage about the practice of animal parents feeding their young?
A.It is unknown among fish.
B.It is unrelated to the size of the young.
C.It is dangerous for the parents.
D.It is most common among mammals.

The author lists various animals in line 5 to…
A.contrast the feeding habits of different types of mammals
B.describe the process by which mammals came to be defined
C.emphasize the point that every type of mammal feeds its own young
D.explain why a particular feature of mammals is nonelective

How many national parks _____ in Vietnam by far?
A.have been set up
B.are set up
C.have set up
D.are being set up

All the tables _____ away before the guests turned up.
A.were taken
B.had been taken
C.had taken
D.were being taken

This house, _____ has a TV and a washing machine, is very modern.
A.which
B.that
C.where
D.in which