进入阀体前，应取下（）和安全带上的保险钩，防止金属打击造成元件、光缆的损坏，但应注意防止高处坠落。
A.安全帽
B.脚扣
C.手套
D.工作服
参考答案：A
Some doctors were sent t?the front where medical workers were ＿＿＿.
A．in great need
B．in great need of
C．needed great
D．needed in
However weak your memory may be, you can make up for it by ______ what you want to remember, and repeating it over and over again.
A．gaining access to
B．attending closely to
C．taking advantage of
D．getting the better of
