【单选题】Paragraphs 2 and 3 are written to______
A.
discuss the cause of the decline of sciences power
B.
show the authors sympathy with scientists
C.
explain the way in which science develop
D.
exemplify the division of science and the humanities
【判断题】In this unit, we will discuss food and health.
【单选题】Unit 11-3.mp3: They will discuss about _______________tomorrow.
【单选题】Paragraphs 2 and 3 are written to ______.
A.
discuss the cause of the decline of science's power
B.
show the author's sympathy with scientists
C.
explain the way in which science develops
D.
exemplify the division of science and the humanities
【简答题】何谓椭球面上的相对法截线和大地线?试鉴别下列各线是否为大地线并简要说明理由:(1)任意方向法截线,(2)子午圈,(3)卯酉圈,(4)平行圈。