题目内容

______I have made no arrangements to deal with such cases.

A. It appear that
B. That appears
C. They appear that
D. It appears that

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______ that the first cheese was probably made more than 4000 years ago by nomadic tribes in Asia.

A. The belief
B. Although they believe
C. It is believed
D. Believing

______to space travelers is high acceleration or deceleration forces.

A. That can be dangerous
B. What can be dangerous
C. They can be dangerous
D. It can be dangerous

______unstable and explodes as a supernova is not known.

A. For a star to become
B. How a star becomes
C. Star becomes
D. That a star is becoming

______composed traditionally has been a subject of debate among scholars.

A. Where ballads how
Ballads were how they
C. How ballads that were
D. How ballads were

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