单项选择题

A．the angular shape of the defective blood cellsB．the c……

The terrible pain during a crisis is caused by______.

A．the angular shape of the defective blood cells
B．the cutoff of oxygen supply in parts of the body
C．the cells stuck in the blood vessels
D．eating spoiled food

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热门试题

单项选择题According to the passage, which is NOT TRUE of sickle-cell anemia

A．It is inherited.
B．It is not contagious.
C．It can be cured.
D．It occurs mostly in Africans.

单项选择题In the Middle Ages, the copying work of books was mainly done by______.

A．monks
B．intellectuals
C．artists
D．merchants

单项选择题What is advertised for sale

A．A type of diesel engine.
B．A type of car.
C．Tourist guidance.
D．A type of diesel.

单项选择题The author of the passage was______.

A．critical of the size of the space shuttle deck
B．amazed by the various exhibits in the Hong Kong Space Museum
C．a Jumbo jet lover
D．was fascinated by the sights of Hong Kong Island

单项选择题The best title for this passage can be ______.

A．How to Develop Your Interest in Reading
B．Books and Magazines: Part of Your Life
C．Writing and Writers
D．The Pleasures of Reading