part i listening to a song directions: listen and fill in the blanks with the missing information. although (1) __________ has always been a friend of mine.
系统稳定的充要条件是:对应劳斯表第一列元素均为正数。
the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.
from daylight, our bodies absorb vitamin d through the skin. certain skin diseases also (2) from exposure to sunlight.
the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.
what is the mission of the jane goodall institute?
what’s the negative side the previous report had?
3ds max是下列哪个公司的产品?( )
they cut discarded books from bindings so the paper could be recycled.