PART TWO LANGUAGE KNOWLEDGE（45分）
SECTION A（15分）
Directions: Beneath each of the following sentences there are 4 choices marked A,B,C and D．Choose the one answer that best completes the sentence．
Example:
The wild flowers looked like a soft orange blanket the desert.
A．covering B．covered C．cover D．to cover
The answer is A.
21．Male nurses are not ______ are needed most, but female doctors are.
A．who B．that C．what D．those
