I wonder who first____the idea of bags with gas to make balloons. A: imagined B: conceived C: cherished D: concealed

Mary was ______ in the exam. A: a first B: first C: the first D: one

Stephanie fell in love with Alex ______. A: at first sight B: at a first sight C: at the first sight D: at first sights

What is the mindset for China’s energy development? A: quantity first B: quality first C: efficiency first D: price first

查找算法find( first, last, val)的参数中,first和last表示的范围用下列哪个区间表示比较合适？? [first,; last)|;(first,; last];|( first, last);|[first,; last]

He is ____ one to come to school every day. A: first B: the first C: the D: a first

The Spring Festival is on ________day of the Chinese lunar year. A: the first B: a first C: first D: one

若A→α B β是一个产生式，则把_______加至FOLLOW(B)中。(A) A: FIRST(β)\{ε} B: FIRST(α)\{ε} C: FIRST(β)\{#} D: FIRST(α)\{#}

”安全第一” 的正确英语表达 A: safe is first B: safe comes first C: safety comes first D: safety come first

对下面文法中非终结符First集合描述正确的是（）。E->(L)|a|εL->EL+|E A: First(L)={ ( a + } B: First(L)={ ( a + ε} C: First(E)={ ( a + } D: First(E)={ ( a + ε}