单项选择题

Viewers simply can watch what is on ______ a presentation via a keyboard, touch screen or mouse.

A．and press on
B．or interact with
C．by pressing
D．or interpret to
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单项选择题
Addition of any chemical compound to the environment in quantities ______ a significant fraction of the total content of gasoline may have unexpected environmental consequences.
A．that constitute
B．which constitutes
C．that are substituted by
D．which substitute
单项选择题
Among the many open research questions on MTBE are how it is metabolized, ______the levels of exposure in the general population are.
A．but what
B．and what
C．but how
D．and why
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