中国大学MOOC:"Non-verbal language is ________ extention of your personality.";

PCR<br/>process includes three steps, they are() A: denaturation B: annealing C: extention D: cooling

1. Before Anglo-American westward ________, there were already a number of settlements in the mid-West. A: examine B: expensive C: extention D: expansion

I have warned you not to do that __________. A: over and over B: over and over again C: again and over D: again and again over

The child may get confused at hearting the color of white used for paper when he/she first thought it as the word for snow. This is an example for _______. A: Over-extention B: Mental retardation C: Under-extention D: Hearing impairment

求函数$y = {{1 + \root 3 \of {{x^2}} - \sqrt {2x} } \over {\sqrt x }}$的导数$y' = $( ) A: $ {1 \over 2}{x^{ - {3 \over 2}}} + {1 \over 6}{x^{ - {5 \over 6}}}$ B: $ - {1 \over 2}{x^{ - {3 \over 2}}} + {1 \over 6}{x^{ - {5 \over 6}}}$ C: ${1 \over 2}{x^{ - {3 \over 2}}} - {1 \over 6}{x^{ - {5 \over 6}}}$ D: ${1 \over 3}{x^{ - {3 \over 2}}} - {1 \over 6}{x^{ - {5 \over 6}}}$

A dog was _______by a bus and killed. A: turned over B: knocked over C: run over D: got over

Don't hand in your papers until class______. A: is over B: was over C: are over D: will be over

函数\(y = \sin {1 \over x}\)的导数为（ ）. A: \({1 \over { { x^2}}}\sin {1 \over x}\) B: \( - {1 \over { { x^2}}}\sin {1 \over x}\) C: \( - {1 \over { { x^2}}}\cos {1 \over x}\) D: \({1 \over { { x^2}}}\cos {1 \over x}\)

We are certain that he will _____ his illness. A: come over B: go over C: get over D: give over