In the lower latitudes of the tropics, hunter-gatherers ________.
A.can free themselves from hunting
B.have better food gathering from nature
C.live along the coasts and waterways for fishing
D.harvest shorter seasonal crops

A.insecticide
B.fertilizer
C.pesticide
D.herbicide

A.historian
B.architecture
C.biography
D.thermometer

A.command
B.compose
C.complain
D.comment

She was unhappy that she lost contact with a lot of her old friends when she went abroad to study.
A.made room for
B.put in charge of
C.lost control
D.got in touch with

Hypertension is one of the most widespread and potential dangerous diseases
A.colossal
B.popular
C.common
D.scattered

In America, when a woman and a man are introduced, shaking hands is up to a woman.
A.depends on
B.replies on
C.waits on
D.congratulates on

A professor of economy and history at our university developed a new theory of the relationship between historical events and financial crises.
A.conomy
B.developed
C.between
D.financial crises

The president refuses to accept either of the four new proposals made by the contractors.
A.to accept
B.either
C.new proposals
D.made by

The word ‘some’ in paragraph 2 refers to_______.
A.young children
B.ages and tastes
C.birthday cards
D.card shops