单项选择题

All mammals have hair, but not always evident.()

A. but it is not
B. but it is
C. but they are not
D. but they are

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单项选择题

Catching sight of her old friend Brown, Mary moved for him to come over and sit in a seat next to her.（）

A. signed
B. swayed
C. twisted
D. signaled

单项选择题

Proper lighting is a necessary for good eyesight even though human night vision can be temporarily impaired by extreme flashes of light.（）

A. needful
B. necessity
C. exigency
D. need

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