题目内容

The girl was mistaken ______ her mohter on the phone.

A. to
B. in
C. for
D. from

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Be alert and protect yourself from being _____________.

A. sponsored
B. scammed
C. banned
D. donated

If you can't find anything about a (A) on the Web or through other research, you might not want to trust the campaign. In fact, if it (B) too much personal information,(C) — this is a common feature of (D) or (E) websites and emails.

One (A) of online charities is that their message can spread at (B). On its first day, FreeRice (C) just over 800(D) of rice. ...The site(E) viral as a result of word of mouth and social networking.

将一棵有50个结点的完全二叉树从根这一层开始,每一层上从左到右依次对结点进行编号,根结点的编号为1,则编号为20的结点的右孩子编号为( )。

A. 41
B. 20
C. 21
D. 40