单项选择题

______ in progress, conference participants must turn off their cell phones and digital cameras.

(A) While
(B) Although
(C) Ever
(D) During
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Their newly ______ toys will be free from material defects and otter you a three-year product guarantee from the date of purchase.
(A) introduced
(B) introduction
(C) introduce
(D) introducing
单项选择题
The man in charge of this laboratory should remind his men that any ______ information on each specimen car cause a considerable damage.
(A) misleading
(B) imported
(C) accurate
(D) impartial
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