听力原文:M: Do you know some forms of bank advances? W: There are three forms: overdrafts, personal loans and mortgages. Q: Which of the following is not a form. of bank advances? (13)
A.
Overdrafts.
B.
Mortgages.
C.
Personal loans.
D.
Letter of credit.
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举一反三
【多选题】Which of the following descriptions about tertiary structure of protein are correct
A.
All polypeptide chains with tertiary structure have biological activities.
B.
Most hydrophilic groups ( 亲水基团 ) are located on the surface of tertiary structure.
C.
The stability of tertiary structure is maintained by covalent bonds.
D.
T ertiary structure is t hree-dimensional arrangement of all atoms in a polypeptide chain.
E.
Formation of tertiary structure i s the result of interaction between side chain groups of a polypeptide chain.