题目内容

说明本征扩散与非本征扩散的区别；正常扩散与反常扩散（逆扩散）的区别，并举出逆扩散的例子。

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Part I··Structure··（10 minutes)Directions: This part is to test your ability to construct grammatically correct sentences.It consists of 2sections.Section A21. I am interested in the training course, which ___________at Hilton Hotel in Beijing from March 8 to 12,2018.

A)held
B) was held
C)will hold
D) will be held

22. In his paper, John is trying to identify___________determines the final result of the project.

A)what
B)whether
C)when
D) how

23. I feel I am entitled to a full refund in addition to an apology for the inconvenience__________________.

A)to cause
B) causing
C)cause
D) caused

24.Recent studies show that employees who take vacation time and leave are____________than those whodo not.

A)efficient
B) most efficient
C)more efficient
D) least efficient