题目内容

丹霞地貌是在白垩纪时期发育的典型地貌。()

A. 对
B. 错

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The plane is flying ________ the clouds.

A. above
B. on
C. on to
D. over

The big tree our classroom is _____100 years old.

A. nearly
B. near

a picture ____ the wall (墙上的画)

人类核苷酸切除修复过程中,在损伤点5'端切割DNA单链的是

A.XPA
B.XPC
C.XPF
D.XPG
E.RPA

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