【题目】It is important to make new laws and create international standards for these laws similar to _______ concerning international airspace.
A.what
B.that
C.those
D.it

【答案】C
【解析】考查代词。句意：制定新的法律并为其建立类似于有关国际空域的国际标准是重要的。those指代standards。concerning 现在分词作定语，修饰those，即standards。故选C。