单项选择题

How did the man respond to the woman's request （）

A．He lent her a car.
B．He offered her a bicycle.
C．He said he did not have any fuel.
D．He was afraid of losing his car.

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单项选择题
What is NOT the characteristic of the earliest language systems（）

A．They combined vocal sounds with hand or body signals to express messages.
B．Some words may be similar to natural sounds.
C．Others may have come from expressions of emotion, such as laughter or crying.
D．The language, some theorists believe, is a result of individual activities, such as working together or dancing.
单项选择题
In the early part of the 20th century, physicians discovered that blood transfusions often failed because （）.

A．the blood type of the donor was not compatible with that of the recipient
B．the blood type of the recipient was not suitable for that of the donor
C．blood type A contains red blood cells that have a substance A on their surface
D．blood cells are necessary for blood transfusion
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