【单选题】SECTION 3 Directions: Each passage in this group is followed by questions based on its content. After reading a passage, choose the best answer to each question. Answer all questions following a passa...
A.
explaining the process by which the Earth and its oceans accreted
B.
reporting how recent research has arrived at a new explanation for the constitution of the Earth's oceans
C.
accounting for the chemical composition of the various ingredients of the Earth's oceans
D.
contrasting various competing hypotheses as to what the Earth's oceans consist of
E.
reporting inconsistencies with the result of new research into the composition of the Earth's oceans
【单选题】Using Bohr's equation for the energy levels of the electron in the hydrogen atom, determine the energy (J) of an electron in the n = 4 level. __________ .
【简答题】A molecule is another tiny particle of matter which is made up of a combination of atoms .A molecule of water ,for example ,consists of two atoms of hydrogen and one of oxygen; a molecule of ordinary ...