单项选择题

Researchers warn (against) taking (large numbers of) vitamin A pills, because the tablets contain a form of (the chemical) flint that can be extremely toxic (with high doses).

A．against
B．large numbers of
C．the chemical
D．with high doses
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单项选择题
Stable political conditions and freedom (from) foreign invasion enable a country to develop its natural resources peacefully and steadily, and (to produce) more wealth than (the other) country equally well served by nature but (less well) ordered.
A．from
B．to produce
C．the other
D．less well
单项选择题
Villagers and those newly arrived from Europe, fed up with terms of employment and tenancy in the rural areas, took advantage of cheap modern transportation to move into the cities.
A．discontented with
B．acquainted with
C．furnished with
D．favoured with
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