单选题In some California housing estates, a key alone is insufficient to get someone in the door; his or her voiceprint must also be ______.

单选题 中国传统元素是指被广泛认可的中国传统形象、符号或风俗习惯等。它们能够反映中国传统文化的精髓(essence)，是中国所特有的元素。中国传统元素体现在文学、艺术、建筑、饮食、服饰及风俗习惯等多个方面。从唐诗宋词、京戏脸谱(facial makeup)、雕梁画栋(richly ornamented building)、中餐茶品到唐装刺绣(embroidery)，无不体现着魅力非凡的(charismatic)中国元素。中国传统元素植根于深厚的中国传统文化，它对中国当代及后世的社会发展都有着不可忽视的重要作用，值得我们继续传承下去。

单选题The storm prevented ______ on a picnic.

单选题She felt dizzy and had to ______ something to steady herself. A. hold onto B. hold up C. hold forth D. hold down

单选题It is the first of several agreements the United States hopes to reach as it attempts to reduce labor costs by $5.8 billion and ______ bankruptcy.

单选题Although we hadn't met for twenty years, I recognized him ______ I saw him.

单选题We wouldn"t lose heart even if we ______ again.

单选题We always lay in a large ______ of tinned food in winter in case we are snowed up. A. proportion B. storage C. provision D. supply

单选题 All the evil in this world is brought about by persons who are always up and doing, but do not know when they ought to be up nor what they ought to be doing. The devil, I take it, is still the busiest creature in the universe, and I can quite imagine him denouncing (谴责) laziness and becoming angry at the smallest waste of time. In his kingdom, I will bet, nobody is allowed to do nothing, not even for a single afternoon. The world, we all freely admit, is in a mess, but I for one do not think that it is laziness that has brought it to that condition. It is not the active virtues that it lacks but the passive ones; it is capable of anything but kindness and a little steady thought. There is still plenty of energy in the world (there never were more fussy people about), but most of it is simply misdirected. If, for example, in July 1914, when there was some capital idling weather, everybody, emperors, kings, archdukes (大公爵), statesmen, generals, journalists, had been suddenly smitten (迷惑) with an intense desire to do nothing, just to hang about in the sunshine and consume tobacco, then we should all have been much better off than we are now. But no, the doctrine of the strenuous (艰苦的) life still went unchallenged; there must be no time wasted; something must be done. And, as we know, something was done. Again, suppose our statesmen, instead of rushing off to Versailles (凡尔赛宫) with a bundle of ill-digested notions and a great deal of energy to dissipate, had all taken a fortnight off, away from all correspondence and interviews and what not, and had simply lounged about on some hillside or other, apparently doing nothing for the first time in their energetic lives, then they might have gone to their so-called Peace Conference and come away again with their reputations still unsoiled and the affairs of the world in good trim. Even at the present time, if half the politicians in Europe would abandon the notion that laziness is a crime and go away and do nothing for a little space, we should certainly gain by it. Other examples come crowding into the mind. Thus, every now and then, certain religious sects (派别) hold conferences, but though there are evils abroad that are mountains high, though the fate of civilization is still doubtful, the members who attend these conferences spend their time condemning the length of ladies' skirts and the noisiness of dance bands. They would all be better employed lying flat on their backs somewhere, staring at the sky and recovering their mental health.

单选题______ I like very much to do science, as a teacher I have to go over the students' papers and thesis.

单选题It (is requested) (that) every student (writes) a paper (on) sustainable development.

单选题It can be inferred from the passage that at one time bees had the ability to ______.

单选题______ took us several hours to clear the snow and open the road to traffic.

单选题The professor can hardly find sufficient grounds ______ his argument in favour of the new theory.

单选题She was always in perfect sympathy with me ______ my love of nature.

单选题The author’s solution to the drug problem is______.