Cho hình vuông ABCD. Tính  cos A C → , B A → .

A. cos A C → , B A → = 2 2 .

B.  cos A C → , B A → = − 2 2 .

C.  cos A C → , B A → = 0.  

D.  cos A C → , B A → = − 1.

Choose the sentence which has the closest meaning to the original one.

David seems really ill at ease in front of all those people.

A. David feels uncomfortable in front of all those people.

B. David is easy to be ill because of all those people.

C. David is ill because he stands in front of all those people.

D. David fells comfortable in front of all those people.

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