23.The instrument as well as other spare parts ______ going to be airlifted soon.（ ）

A.be

B.are

C.is

D.will

23.C【解析】当主语后有no less than， with， along with， together with， accompanied by， as well as， rather than， including， besides， in addition to， except等时，谓语动词的单复数仍与主语的单复数保持一致。本题主语instrument为单数名词，谓语用is。故选C。

24.A vaccum tube is a glass tube from which most of the air has been removed，______an almost complete vaccum.（ ）

A.is creating

B.creates

C.creating

D.it creates

24.C【解析】句意：真空管是一种玻璃管，其中大部分空气已被抽离，造成一个接近真空的状态。“造成真空状态”是伴随主句“大部分空气被抽离”这个动作的状态，是同时发生的，因此要用动词ing形式。故选C。