胆碱酯酶抑制法是目前农药残留测定中常用的快速筛查法，但它主要_爱下问搜题

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问题单项选择题

胆碱酯酶抑制法是目前农药残留测定中常用的快速筛查法，但它主要适用于下列哪类农药

A．有机氯类

B．拟除虫菊酯类

C．有机磷类

D．沙蚕毒素类

答案

参考答案：C

完形填空

Immediately I got up and dressed, I stuck my violin under my jacket and went out into the streets to try my 36 . I wandered about for an hour, looking for a likely 37 , feeling as though I were about to commit a crime. Then I 38 at last under a bridge near the station and decided to have a try.
I felt tense and 39 . It was the first time, after all. I drew the violin from under the jacket like a gun. It was here, in Southampton, with trains rattling overhead, that I was about to   40 myself. One moment I was part of the hurrying crowds, the next I stood apart, my back to the wall, my hat on the 41  before me, the violin under my chin.
The first notes I played were loud and raw, like a declaration of protest, then they settled down and began to run more _42 and to stay more or less in tune. To my 43 ,I was neither arrested nor told to shut up. Indeed, nobody took any 44 at all. Then an old man, without stopping at all, dropped a penny into my 45   as though getting rid of some guilty evidence.
I worked the streets of Southampton for several days, gradually obtaining the truth of the    46 by trial and error. It was not a good thing, for instance, to let the hat fill up with money---the sight could 47 a kind-hearted man; nor was it wise to 48 it completely, which could also confuse him, giving him no hint as to where to 49 his money. Placing a couple of pennies in the hat to start the thing going soon became a 50  practice and I made sure, between tunes, to take off most of the earnings, but always leaving two 51 behind.
Old 52 were most generous, and so were women with children, shop girls and barmaids. As for men, heavy drinkers were always willing listeners and so were big guys with muscles. But 53 a man with an expensive hat, briefcase or dog: respectable types were the least 54 of all. Except for retired army officers, who would shout "Why aren't you 55 , young man?" and then would over-tip to cover up their confusion.

C．astonishment

C．performance

B．comfortable

单项选择题

（）系统地运用科学实验方法，发现了自由落体定律。

A.亚里士多德

B.达芬奇

C.伽利略

D.培根